Northumberland County, Virginia
County seat: Heathsville · Population 12,557 (2025) · 191 sq mi
Northumberland County is the 107th most populous of Virginia's 133 counties, with 12,557 people (2025 estimate). Its county seat is Heathsville. It is part of the Northern Neck Planning District Commission (PD 17) region, one of the 21 Planning District Commissions of Virginia. The map shows its 1 city or town and the 6 neighboring counties.
Northumberland County facts
- County seat
- Heathsville
- Population (2025 estimate)
- 12,557 +6.1% since 2020
- Land area
- 191 sq mi 88th largest of 133
- Water area
- 94 sq mi
- Population density
- 66 per sq mi
- Established
- 1648
- Named after
- Northumberland ceremonial county and unitary authority area in north east England, UK
- Largest city
- Heathsville 98
- Median household income
- $66,480
- Cities and towns
- 1 plus 1 CDPs
- ZIP codes
- 7
- Time zone
- Eastern
- FIPS code
- 51133
Cities and towns in Northumberland County
Northumberland County has 1 incorporated place. Populations count the people living inside Northumberland County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Kilmarnock | Town | 76 | Lancaster County |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Heathsville | 98 |
ZIP codes in Northumberland County
7 ZIP codes reach into Northumberland County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 22432
- 22435 also Richmond and Westmoreland counties
- 22473 also Lancaster County
- 22482 also Lancaster County
- 22503 also Lancaster County
- 22511
- 22539
Population of Northumberland County, 2020–2025
Northumberland County grew by 722 people (+6.1%) between April 2020 and July 2025: 667 more deaths than births and a net gain of 1,389 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 11,838 |
| 2021 | 12,053 |
| 2022 | 12,262 |
| 2023 | 12,410 |
| 2024 | 12,412 |
| 2025 | 12,557 |
Neighboring counties
- Lancaster County south · 10,995 people
- St. Mary's County, Maryland north · 116,692 people
- Accomack County east · 33,859 people
- Richmond County west · 9,294 people
- Westmoreland County northwest · 19,715 people
- Somerset County, Maryland northeast · 24,973 people
Printable Northumberland 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.
- PDF (Letter) (94 KB)
- PNG (2400 px) (96 KB)
Paste this code to embed the map on your site:
Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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