Gwinnett County, Georgia

County seat: Lawrenceville · Population 1 million (2025) · 431 sq mi

Gwinnett County is the 2nd most populous of Georgia's 159 counties, with 1,018,099 people (2025 estimate). Its county seat is Lawrenceville. It is part of the Atlanta region, one of the 12 Georgia Regional Commissions. The map shows its 18 cities and towns and the 8 neighboring counties.

Map of Gwinnett County, Georgia with cities, towns and the county boundary
Gwinnett County, Georgia 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) 142 KBPNG image 120 KBGeorgia county map

Gwinnett County facts

County seat
Lawrenceville
Population (2025 estimate)
1,018,099 +6.3% since 2020
Land area
431 sq mi 48th largest of 159
Water area
6 sq mi
Population density
2,361 per sq mi
Established
1818
Named after
Button Gwinnett American politician (1735-1777)
Largest city
Peachtree Corners 42,519
Median household income
$87,890
Cities and towns
18 plus 1 CDPs
ZIP codes
26
Time zone
Eastern
FIPS code
13135

Cities and towns in Gwinnett County

Gwinnett County has 18 incorporated cities, towns and villages. Populations count the people living inside Gwinnett County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
Peachtree CornersCity42,519
MulberryCity41,445
DuluthCity33,815
Lawrenceville (county seat)City32,822
Sugar HillCity29,280
SuwaneeCity23,034
SnellvilleCity22,478
NorcrossCity19,086
LilburnCity16,369
BufordCity15,785Hall County
DaculaCity9,373
GraysonCity5,569
BraseltonTown5,461Barrow, Hall and Jackson counties
LoganvilleCity3,769Walton County
Berkeley LakeCity2,034
AuburnCity281Barrow County
DoravilleCity41DeKalb County
Rest HavenTown19Hall County

Unincorporated communities (CDPs)

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

CommunityPopulationAlso in
Mountain Park12,850

ZIP codes in Gwinnett County

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

Population of Gwinnett County, 2020–2025

Gwinnett County grew by 60,714 people (+6.3%) between April 2020 and July 2025: 28,416 more births than deaths and a net gain of 31,883 people from migration.

Year (July 1)Population
2020958,317
2021965,016
2022979,814
2023992,058
20241,009,864
20251,018,099

Neighboring counties

Printable Gwinnett County map

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Sources

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