Weld County, Colorado

County seat: Greeley · Population 378,426 (2025) · 3,985 sq mi

Weld County is the 7th most populous of Colorado's 64 counties, with 378,426 people (2025 estimate). Its county seat is Greeley. It is part of the Region 2: Northern Front Range region, one of the 14 Planning and Management Regions of Colorado. The map shows its 32 cities and towns and the 8 neighboring counties.

Map of Weld County, Colorado with cities, towns and the county boundary
Weld County, Colorado with its cities and towns, unincorporated communities (CDPs) and neighboring counties. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).
Download PDF (Letter) 134 KBPNG image 95 KBColorado county map

Weld County facts

County seat
Greeley
Population (2025 estimate)
378,426 +15% since 2020
Land area
3,985 sq mi 3rd largest of 64
Water area
32 sq mi
Population density
95 per sq mi
Established
1861
Named after
Lewis Ledyard Weld American lawyer, politician, and Union Army officer
Largest city
Greeley 115,073
Median household income
$97,097
Cities and towns
32 plus 2 CDPs
ZIP codes
43
Time zone
Mountain
FIPS code
08123

Cities and towns in Weld County

Weld County has 32 incorporated cities, towns and villages. Populations count the people living inside Weld County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
Greeley (county seat)City115,073
WindsorTown34,551Larimer County
ErieTown25,509Boulder County
EvansCity22,500
FirestoneTown20,129
FrederickTown18,241
JohnstownTown16,166Larimer County
SeveranceTown11,841
Fort LuptonCity10,402
MillikenTown9,183
LochbuieTown8,776Adams County
MeadTown7,042
DaconoCity6,844
EatonTown5,848
PlattevilleTown2,908
AultTown2,667
La SalleTown2,304
KeenesburgTown2,107
HudsonTown1,621
KerseyTown1,500
LongmontCity1,302Boulder County
PierceTown1,086
GilcrestTown1,017
NunnTown539
BrightonCity461Adams County
BerthoudTown264Larimer County
Garden CityTown250
GroverTown152
New RaymerTown111
NorthglennCity24Adams County
TimnathTown8Larimer County
ThorntonCity0Adams County

Unincorporated communities (CDPs)

Census-designated places are communities without their own city government; the county provides their services.

CommunityPopulationAlso in
Aristocrat Ranchettes1,747
Briggsdale88

ZIP codes in Weld County

43 ZIP codes reach into Weld County. ZIP codes ignore county lines, so some also cover a neighboring county.

Population of Weld County, 2020–2025

Weld County grew by 49,445 people (+15%) between April 2020 and July 2025: 12,883 more births than deaths and a net gain of 36,285 people from migration.

Year (July 1)Population
2020331,434
2021339,891
2022350,793
2023360,971
2024371,280
2025378,426

Neighboring counties

Printable Weld County map

The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.

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Sources

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