County Maps US

Harford County, Maryland

A county in Maryland, ranked 8 of 24 by population.

CountyFIPS 24025

Within Maryland
Harford County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Bel Air, the county seat, located via the 2025 Census Gazetteer.

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Population
266,446
+5,211 (+2.0%) since 2020
Land area
437.1
square miles. A further 17.0% of the total area is water
Population density
610
people per square mile, computed rather than published
County seat
Bel Air
Seat of county government.
Established
1773
252 years ago
Largest city
Aberdeen city
Population 18,374.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Harford County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Harford County, Maryland from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 714 by 800 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Harford County ranks

Position among the 24 counties of Maryland, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn MarylandNationally
Population266,4468th of 24278th of 3,144
Land area437.1 sq mi11th of 242,318th of 3,144
Population density610 per sq mi7th of 24237th of 3,144
Median household income$112,26510th of 2481st of 3,143

Full data for Harford County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population266,446Vintage 2025 Population Estimates
Population in 2020261,235Vintage 2025 Population Estimates
2020 estimates base?260,933Vintage 2025 Population Estimates
Land area437.1 sq mi2025 Gazetteer Files
Water area89.5 sq mi2025 Gazetteer Files
Total area526.7 sq mi2025 Gazetteer Files
Population density?610 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$112,265American Community Survey 2020-2024 5-Year Estimates
Median home value$386,400American Community Survey 2020-2024 5-Year Estimates
Median age40.5American Community Survey 2020-2024 5-Year Estimates
Households101,795American Community Survey 2020-2024 5-Year Estimates
Housing units105,468American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
+211
2,621 births, 2,410 deaths
Net migration
+601
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 5 areas bordering Harford County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Baltimore CountyMaryland48 mi847,650
Cecil CountyMaryland26 mi107,131
York CountyPennsylvania18 mi473,197
Kent CountyMaryland15 mi19,565
Lancaster CountyPennsylvania0.3 mi563,159

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 24 counties of Maryland

Open the interactive Maryland county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.