Counties in Colorado by natural change, July to June

El Paso County had the highest natural change, July to June of 64 counties in 2018, at 4,728. Fremont County had the lowest, at -196. The median was 17 and the figure for Colorado was 25,624. Source: the U.S. Census Bureau.

Highest4,728El Paso County

Lowest-196Fremont County

Median1764 counties

Colorado25,624History

Top 40 counties, 2018

persons. Source: U.S. Census Bureau, Population Estimates Program: natural change (births minus deaths), July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021. Retrieved 2026-10-12.

Full ranking

Rank	Counties	2018 persons	Change on 2017
1	El Paso County Estimated	4,728	-2.7%
2	Denver County Estimated	4,536	-2.9%
3	Adams County Estimated	3,822	-6.9%
4	Arapahoe County Estimated	3,685	-5.5%
5	Weld County Estimated	2,396	-3.2%
6	Douglas County Estimated	1,991	-7.3%
7	Jefferson County Estimated	1,113	-24.7%
8	Larimer County Estimated	887	-4.5%
9	Boulder County Estimated	737	-12.8%
10	Eagle County Estimated	438	-8.4%
11	Garfield County Estimated	432	-13.4%
12	Broomfield County Estimated	246	-22.2%
13	Summit County Estimated	205	-2.4%
14	Morgan County Estimated	195	+65.3%
15	Mesa County Estimated	133	0%
16	La Plata County Estimated	112	-21.7%
17	Routt County Estimated	73	-29.1%
18	Alamosa County Estimated	60	+42.9%
19	Moffat County Estimated	57	-23%
20	Pitkin County Estimated	48	-57.5%
21	Elbert County Estimated	46	-35.2%
21	Gunnison County Estimated	46	-30.3%
23	Lake County Estimated	45	-4.3%
24	Logan County Estimated	39	+290%
25	San Miguel County Estimated	37	-28.8%
26	Yuma County Estimated	36	+28.6%
27	Prowers County Estimated	31	-20.5%
28	Rio Blanco County Estimated	29	+26.1%
29	Park County Estimated	23	+21.1%
30	Montrose County Estimated	22	+450%
31	Grand County Estimated	20	-68.3%
32	Gilpin County Estimated	17	+30.8%
33	Saguache County Estimated	16	-11.1%
34	Clear Creek County Estimated	15	-42.3%
35	Archuleta County Estimated	13	-56.7%
35	Montezuma County Estimated	13	+137.1%
37	Kit Carson County Estimated	3	-80%
37	Mineral County Estimated	3	+130%
39	Lincoln County Estimated	2	0%
39	San Juan County Estimated	2	+100%
41	Jackson County Estimated	-1	-150%
41	Pueblo County Estimated	-1	-105.6%
43	Teller County Estimated	-3	-110%
43	Washington County Estimated	-3	-175%
45	Cheyenne County Estimated	-6	-700%
45	Dolores County Estimated	-6	+33.3%
45	Hinsdale County Estimated	-6	n/a
48	Crowley County Estimated	-7	+56.3%
48	Kiowa County Estimated	-7	-75%
50	Otero County Estimated	-8	+20%
51	Ouray County Estimated	-9	-175%
52	Conejos County Estimated	-12	-152.2%
52	Rio Grande County Estimated	-12	+33.3%
54	Phillips County Estimated	-13	-550%
55	Sedgwick County Estimated	-14	0%
56	Costilla County Estimated	-15	n/a
56	Custer County Estimated	-15	-150%
58	Baca County Estimated	-24	-242.9%
59	Chaffee County Estimated	-30	+36.2%
60	Bent County Estimated	-54	-86.2%
61	Huerfano County Estimated	-57	+24%
62	Las Animas County Estimated	-67	-91.4%
63	Delta County Estimated	-162	-47.3%
64	Fremont County Estimated	-196	+2.5%

Other periods

About this ranking

Estimated births minus deaths of residents from July 1 of the previous year through June 30 of the reported year. A negative value means more deaths than births.

Equals births_july_june minus deaths_july_june for the same place and year. Not a calendar-year figure.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. Population Estimates Program: natural change (births minus deaths), July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021. 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: natural change (births minus deaths), July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021 (Counties in Colorado by natural change, July to June, 2018) [Data set]. Retrieved October 12, 2026, from https://www.census.gov/programs-surveys/popest/data/data-sets.html

MLA 9

Population Estimates Program: natural change (births minus deaths), July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021, Counties in Colorado by natural change, July to June, 2018. U.S. Census Bureau, 26 Mar. 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/natural-change-july-june/colorado-counties?period=2018. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program: natural change (births minus deaths), July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021. Counties in Colorado by natural change, July to June, 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/natural-change-july-june/colorado-counties?period=2018.

Harvard

U.S. Census Bureau (2026) Population Estimates Program: natural change (births minus deaths), July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021, Counties in Colorado by natural change, July to June, 2018 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/natural-change-july-june/colorado-counties?period=2018 (Accessed: 12 October 2026).

BibTeX

@misc{census_counties_in_colorado_by_2018,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program: natural change (births minus deaths), July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021: Counties in Colorado by natural change, July to June, 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/natural-change-july-june/colorado-counties?period=2018. Publisher attribution: U.S. Census Bureau. Population Estimates Program: natural change (births minus deaths), July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021. 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: natural change (births minus deaths), July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021: Counties in Colorado by natural change, July to June, 2018
PY  - 2026
DA  - 2026/03/26
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www.census.gov/programs-surveys/popest/data/data-sets.html
L2  - https://invokely.ai/rankings/natural-change-july-june/colorado-counties?period=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/natural-change-july-june/colorado-counties?period=2018.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program: natural change (births minus deaths), July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021. 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 natural change, July to June?

El Paso County, with 4,728 in 2018, according to the U.S. Census Bureau.

Which county has the lowest natural change, July to June?

Fremont County, with -196 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: natural change (births minus deaths), July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021. Retrieved 2026-10-12.