Data / Rankings / Median age on 1 July (US county estimates) / US counties

US counties by median age on 1 July (US county estimates)

Sumter County had the highest median age on 1 July (US county estimates) of 3135 counties in 2018, at 67.8 years. Lexington city had the lowest, at 22.6 years. The median was 41.8 years. Source: the U.S. Census Bureau.

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Highest67.8Sumter County
Lowest22.6Lexington city
Median41.83135 counties

Map of counties, 2018

years, 2018. Hatched areas have no value for this period. Source: U.S. Census Bureau, Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2018

Sumter County: 67.8 yearsSumter County67.8Catron County: 61.6 yearsCatron County61.6Charlotte County: 59.5 yearsCharlotte County59.5Jefferson County: 59 yearsJefferson County59Alcona County: 58.4 yearsAlcona County58.4Ontonagon County: 58.4 yearsOntonagon County58.4Custer County: 58.2 yearsCuster County58.2Lancaster County: 58.1 yearsLancaster County58.1Northumberland County: 58.1 yearsNorthumberland County58.1Highland County: 57.6 yearsHighland County57.6Jeff Davis County: 57.6 yearsJeff Davis County57.6Keweenaw County: 57.6 yearsKeweenaw County57.6Citrus County: 57.3 yearsCitrus County57.3Curry County: 56.9 yearsCurry County56.9McCormick County: 56.8 yearsMcCormick County56.8Llano County: 56.7 yearsLlano County56.7Sarasota County: 56.7 yearsSarasota County56.7Hamilton County: 56.5 yearsHamilton County56.5Sierra County: 56.5 yearsSierra County56.5Montmorency County: 56.3 yearsMontmorency County56.3Mineral County: 56.2 yearsMineral County56.2Roscommon County: 56.2 yearsRoscommon County56.2Harding County: 56.1 yearsHarding County56.1Custer County: 56 yearsCuster County56Hickory County: 56 yearsHickory County56Iron County: 56 yearsIron County56Towns County: 56 yearsTowns County56Vilas County: 56 yearsVilas County56San Juan County: 55.8 yearsSan Juan County55.8Huerfano County: 55.6 yearsHuerfano County55.6Aitkin County: 55.5 yearsAitkin County55.5Storey County: 55.5 yearsStorey County55.5Wheeler County: 55.2 yearsWheeler County55.2Brunswick County: 55.1 yearsBrunswick County55.1Presque Isle County: 55.1 yearsPresque Isle County55.1Real County: 54.9 yearsReal County54.9Union County: 54.7 yearsUnion County54.7Adams County: 54.5 yearsAdams County54.5Hinsdale County: 54.5 yearsHinsdale County54.5Sierra County: 54.5 yearsSierra County54.5Sumter County: 67.8 yearsSumter County67.8Catron County: 61.6 yearsCatron County61.6Charlotte County: 59.5 yearsCharlotte County59.5Jefferson County: 59 yearsJefferson County59Alcona County: 58.4 yearsAlcona County58.4Ontonagon County: 58.4 yearsOntonagon County58.4Custer County: 58.2 yearsCuster County58.2Lancaster County: 58.1 yearsLancaster County58.1Northumberland County: 58.1 yearsNorthumberland County58.1Highland County: 57.6 yearsHighland County57.6Jeff Davis County: 57.6 yearsJeff Davis County57.6Keweenaw County: 57.6 yearsKeweenaw County57.6Citrus County: 57.3 yearsCitrus County57.3Curry County: 56.9 yearsCurry County56.9McCormick County: 56.8 yearsMcCormick County56.8Llano County: 56.7 yearsLlano County56.7Sarasota County: 56.7 yearsSarasota County56.7Hamilton County: 56.5 yearsHamilton County56.5Sierra County: 56.5 yearsSierra County56.5Montmorency County: 56.3 yearsMontmorency County56.3Mineral County: 56.2 yearsMineral County56.2Roscommon County: 56.2 yearsRoscommon County56.2Harding County: 56.1 yearsHarding County56.1Custer County: 56 yearsCuster County56Hickory County: 56 yearsHickory County56Iron County: 56 yearsIron County56Towns County: 56 yearsTowns County56Vilas County: 56 yearsVilas County56San Juan County: 55.8 yearsSan Juan County55.8Huerfano County: 55.6 yearsHuerfano County55.6Aitkin County: 55.5 yearsAitkin County55.5Storey County: 55.5 yearsStorey County55.5Wheeler County: 55.2 yearsWheeler County55.2Brunswick County: 55.1 yearsBrunswick County55.1Presque Isle County: 55.1 yearsPresque Isle County55.1Real County: 54.9 yearsReal County54.9Union County: 54.7 yearsUnion County54.7Adams County: 54.5 yearsAdams County54.5Hinsdale County: 54.5 yearsHinsdale County54.5Sierra County: 54.5 yearsSierra County54.5
years. Source: U.S. Census Bureau, Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Retrieved 2026-10-12.

Full ranking

RankCounties2018
years		Change on 2017
1Sumter County67.8+0.4
2Catron County61.6+0.4
3Charlotte County59.5+0.4
4Jefferson County59+0.5
5Alcona County58.4+0.2
5Ontonagon County58.4+0.5
7Custer County58.2+1.1
8Lancaster County58.1+0.2
8Northumberland County58.1+0.6
10Highland County57.6+0.8
10Jeff Davis County57.6+1.3
10Keweenaw County57.6+0.8
13Citrus County57.3+0.2
14Curry County56.9+0.5
15McCormick County56.8+1.2
16Llano County56.7+0.3
16Sarasota County56.7+0.5
18Hamilton County56.5+0.6
18Sierra County56.5+0.1
20Montmorency County56.3+0.2
21Mineral County56.2+0.1
21Roscommon County56.2+0.2
23Harding County56.1-0.3
24Custer County56+0.9
24Hickory County56+0.5
24Iron County56+0.3
24Towns County56+0.1
24Vilas County56+0.7
29San Juan County55.8-0.1
30Huerfano County55.6-0.5
31Aitkin County55.5+0.3
31Storey County55.5+0.8
33Wheeler County55.2-0.1
34Brunswick County55.1+0.9
34Presque Isle County55.1+0.3
36Real County54.9+0.7
37Union County54.7+0.4
38Adams County54.5+0.4
38Hinsdale County54.5-0.2
38Sierra County54.50
41Florence County54.4+0.8
41Sanders County54.4+0.1
43Leelanau County54.3+0.2
43Middlesex County54.3-0.2
43Yavapai County54.3+0.6
46Boyd County54.2+1
46Clay County54.2+0.5
46Esmeralda County54.2+0.1
49Barnstable County54.1+0.5
49Fall River County54.1+0.2
49Iron County54.1-0.1
49La Paz County54.1-0.7
49Pamlico County54.1+0.5
54Highlands County54+0.2
55Indian River County53.9+0.6
55Mathews County53.9+0.2
55Nelson County53.90
58Door County53.8+0.3
58Meagher County53.8+0.3
58Oscoda County53.8+0.6
61Stone County53.7+0.3
62Bayfield County53.6+0.6
62Campbell County53.6+0.7
62Carroll County53.6+0.5
62Ouray County53.6+0.6
66Benton County53.50
66Lincoln County53.5+0.3
68Kent County53.4+0.6
68McIntosh County53.4-0.3
68Nye County53.4+0.2
71Mineral County53.3+0.3
71Pacific County53.3+0.3
71Stonewall County53.3+2.6
74Burnett County53.2+0.2
74Iosco County53.2+0.2
74Loup County53.2+0.3
74Quitman County53.2+0.9
74Wallowa County53.2+0.3
79Adams County53.1-0.1
79Bandera County53.1+0.3
79Douglas County53.1+0.7
79Flagler County53.1+0.6
79Menard County53.1-0.2
79Polk County53.1+0.3
79Wahkiakum County53.10
86Granite County52.9+0.1
86Mackinac County52.9+0.2
86Marion County52.9-0.1
86Mohave County52.9+0.7
86Plumas County52.90
91Baxter County52.8+0.1
91Boise County52.80
91Cook County52.8+0.3
91Lemhi County52.8+0.2
91Lincoln County52.8+0.5
91Sabine County52.80
97Madison County52.7-0.2
97Schoolcraft County52.7+0.3
99Kimble County52.6+0.9
99Sullivan County52.6+0.9
101Aransas County52.5+1.8
101Cumberland County52.5+0.7
101Gillespie County52.5+0.1
101Martin County52.5+0.2
105Judith Basin County52.4+0.3
106Fannin County52.3+0.1
106Pendleton County52.3+0.3
106Prairie County52.3-0.3
106Price County52.3+0.3
110Clallam County52.2+0.5
110Custer County52.2-0.7
110Lincoln County52.2+0.3
113Cherokee County52.1+0.5
113Marion County52.1+0.7
113Mariposa County52.1-0.2
113Petroleum County52.1+1.2
117Golden Valley County52-0.1
117Oneida County52+0.2
117Potter County52-0.4
120Blanco County51.9+0.9
120Elk County51.9-0.2
120Piscataquis County51.9+0.2
120Washburn County51.9+0.3
124Collier County51.8+0.7
124Emmons County51.8-0.2
124Grant County51.8-0.5
124Mason County51.8+0.2
124Sawyer County51.8+0.5
129Costilla County51.7-0.3
129Lincoln County51.7+0.1
129Pend Oreille County51.7+0.4
129Rappahannock County51.7+0.2
133Antrim County51.6+0.5
133Calaveras County51.6+0.1
133Garden County51.6-0.5
133Grant County51.6+0.1
133Mora County51.6+0.7
133Rock County51.6+1.3
139Alpine County51.5+1.8
139Ozark County51.5+0.5
141Charles City County51.4+0.2
141Columbia County51.4+0.4
141Motley County51.4-1
141Pope County51.4+0.6
145Adams County51.3+0.1
145Amador County51.3-0.1
145Cameron County51.3+0.5
145Nelson County51.3+0.2
145Smith County51.3-0.3
145Talbot County51.3+0.3
145Wells County51.30
152Hardin County51.2+0.3
152Musselshell County51.2+0.1
152Sheridan County51.2+0.2
155Camden County51.1+0.2
155Gila County51.1+0.6
155Graham County51.10
155Jewell County51.1-0.8
155Northampton County51.1+0.9
155Teller County51.1+0.2
161Archuleta County51+0.1
161Clearwater County51+0.3
161Greene County51+0.4
161Idaho County51+0.1
161Lake County51+0.7
166Lake of the Woods County50.9-0.3
166Northampton County50.9+0.6
168Cape May County50.8+0.4
168Montgomery County50.8+0.2
170Essex County50.7+0.1
170Ness County50.7+0.3
172Bath County50.6-0.1
172Cheboygan County50.6+0.2
172Georgetown County50.6+0.6
172Lake County50.6-0.3
172Newton County50.6+0.2
172Surry County50.6+0.7
172Talbot County50.6+0.2
179Benzie County50.5+0.2
179Franklin County50.5+1.9
179Gladwin County50.5+0.2
179Kalawao County50.5-3.7
179Ogemaw County50.5+0.4
184Arenac County50.4+0.1
184Crawford County50.4+0.4
186Foard County50.3+1.1
186Pickett County50.3+0.5
186Transylvania County50.3-0.1
186Worcester County50.3+0.1
190Decatur County50.2-0.2
191Alleghany County50.1+0.4
191Coke County50.1-0.3
191Macon County50.1+0.2
191Manistee County50.1+0.2
191Throckmorton County50.1+1.5
191Trinity County50.1+0.1
197Henderson County50+0.5
197Marquette County50+0.1
197Patrick County50+0.4
197San Augustine County50+0.5
201Alger County49.9+0.1
201Carbon County49.9+0.2
201Cleburne County49.9+0.5
201Jo Daviess County49.9+0.4
201Marion County49.9+0.2
201Perquimans County49.9+0.3
207Kerr County49.8+0.1
207Mills County49.8+0.5
207Stone County49.8+0.2
210Coos County49.7+0.2
210De Baca County49.7-0.7
210Ferry County49.7-0.4
210Griggs County49.7-0.5
210Nevada County49.7+0.1
210Sussex County49.7+0.8
210Westmoreland County49.7+0.3
210Wood County49.7+0.3
218Cass County49.6+0.4
218Pocahontas County49.6+0.2
218Powder River County49.6+0.4
218Rusk County49.6+0.5
222Carteret County49.5+0.5
222Hernando County49.50
222Ravalli County49.5+0.3
222Republic County49.5-0.8
222Taliaferro County49.5+0.7
222Treasure County49.5-1.6
228Brown County49.4+0.2
228Deuel County49.40
228Jackson County49.4-0.1
228Keya Paha County49.4-0.4
228Mecklenburg County49.4+0.2
228Sedgwick County49.4+0.7
228Towner County49.4+0.1
235Grand Isle County49.3+0.3
235Harlan County49.3-0.5
235Osborne County49.3+0.8
235Park County49.3-0.4
235Twiggs County49.3+0.5
240Ashe County49.2+0.4
240Coleman County49.20
240Gilliam County49.2-0.9
240Lewis County49.2+0.9
240Ottawa County49.2+0.3
240Tucker County49.2+0.5
240Washington County49.2+0.6
240Waushara County49.2+0.4
248Chaffee County49.10
248Charlevoix County49.1+0.2
248Colfax County49.1+0.6

Showing the top 250 of 3135. The Excel download has every row.

Other periods

About this ranking

Age that divides the resident population of a US county into two halves of equal size on 1 July, from Census Bureau population estimates calculated by single year of age.

Counties only: the county file has no state or national medians, and medians cannot be added up. A single-year estimate, unlike median_age, which for US places is a five-year American Community Survey estimate.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. 9 counties with data in other periods have no value for 2018 and are left out rather than filled from another source. Equal values share a rank.

How to cite

U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Census Bureau. (2026). Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage (US counties by median age on 1 July (US county estimates), 2018) [Data set]. Retrieved October 12, 2026, from https://www.census.gov/programs-surveys/popest/data/data-sets.html

MLA 9

Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage, US counties by median age on 1 July (US county estimates), 2018. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/us-counties?period=2018. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. US counties by median age on 1 July (US county estimates), 2018. Dataset. Accessed October 12, 2026. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Also distributed by Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/us-counties?period=2018.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage, US counties by median age on 1 July (US county estimates), 2018 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/median-age-july-1-us-counties/us-counties?period=2018 (Accessed: 12 October 2026).

BibTeX
@misc{census_us_counties_by_median_2018,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: median age (MEDIAN\_AGE\_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage: US counties by median age on 1 July (US county estimates), 2018}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.census.gov/programs-surveys/popest/data/data-sets.html},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/us-counties?period=2018. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN\_AGE\_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage: US counties by median age on 1 July (US county estimates), 2018
PY  - 2026
DA  - 2026/06/25
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www.census.gov/programs-surveys/popest/data/data-sets.html
L2  - https://invokely.ai/rankings/median-age-july-1-us-counties/us-counties?period=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/us-counties?period=2018.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.
ER  -
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Questions

Which county has the highest median age on 1 July (US county estimates)?

Sumter County, with 67.8 years in 2018, according to the U.S. Census Bureau.

Which county has the lowest median age on 1 July (US county estimates)?

Lexington city, with 22.6 years in 2018.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Retrieved 2026-10-12. 9 counties have no value for 2018 and are not ranked.

Median age on 1 July (US county estimates): other rankings

US counties: more rankings