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40. Hudson County, New Jersey
> Net population change, 2020-2021: -2.8% (-20,192 people)
> Net change from migration: -23,731 people
> Natural population change: +3,925 people
> Total population, 2021: 702,463
> Largest place in county: Jersey City
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39. Aleutians West Census Area, Alaska
> Net population change, 2020-2021: -2.8% (-147 people)
> Net change from migration: -160 people
> Natural population change: +15 people
> Total population, 2021: 5,059
> Largest place in county: Unalaska
24/7 Wall St.
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38. Bronx County, New York
> Net population change, 2020-2021: -2.8% (-41,490 people)
> Net change from migration: -46,308 people
> Natural population change: +5,551 people
> Total population, 2021: 1,424,948
> Largest place in county: The Bronx (NYC)
Source: ChrisBoswell / iStock via Getty Images
37. Northwest Arctic Borough, Alaska
> Net population change, 2020-2021: -2.9% (-224 people)
> Net change from migration: -312 people
> Natural population change: +93 people
> Total population, 2021: 7,560
> Largest place in county: Kotzebue
36. Hemphill County, Texas
> Net population change, 2020-2021: -2.9% (-97 people)
> Net change from migration: -90 people
> Natural population change: -7 people
> Total population, 2021: 3,271
> Largest place in county: Canadian
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