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Counties in Delaware

Delaware has 3 counties. Find yours from your location, or explore the map and the full list with seats, population, time zones and FIPS codes.

Updated November 1, 2026 · Data: U.S. Census Bureau

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Delaware has 3 counties, home to about 1,005,872 people. Sort the table by any column, or search by name or seat.

Counties3Eastern time

Most peopleNew Castle County573,030 residents, 57% of the state

Fewest peopleKent County185,043 residents

Most crowdedNew Castle County1,344 people per sq mi

Largest by landSussex County936.1 sq mi

Priciest homesSussex Countymedian value $353,300

Delaware county map

Population185k573k573k185k185k248k248kno data

Map of all 3 counties in Delaware. Hover or tap a county for its facts; select it to find it in the table. Sources: Census TIGER/Line 2024, ACS 2019-2023 5-year, timezone-boundary-builder.

County explorer: all 3 counties in Delaware

3 shown

County	Seat	Population	Land sq mi	People / sq mi	Median home	Time zone	FIPS
New Castle	Wilmington	573,030	426.3	1,344	$329,800	Eastern	10003
Sussex	Georgetown	247,799	936.1	265	$353,300	Eastern	10005
Kent	Dover	185,043	586.1	316	$290,600	Eastern	10001

Which Delaware cities are in more than one county?

Milford: Sussex County 60.5%, Kent County 39.5% of residents

Sources: Census TIGER/Line 2024; ACS 2019-2023 5-year; Wikidata, CC0 (seats); timezone-boundary-builder (time zones). Data as of November 1, 2026. Not affiliated with any government agency.

FAQ

Frequently asked questions

How many counties are in Delaware?

3.

What is the most populated county in Delaware?

New Castle County, with about 573,030 people (57% of the state).

What is the least populated county in Delaware?

Kent County, with about 185,043 people.

What is the largest county in Delaware by land?

Sussex County, 936.1 sq mi of land.

What county am I in, in Delaware?

Use the tool at the top of this page: press Use my current location, or type your city or ZIP code.

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© 2026 CountyFinder Privacy Terms Disclaimer Accessibility Data: U.S. Census Bureau 2024

CountyFinder is an independent website. It is not affiliated with the U.S. Census Bureau, USPS or any county, state or federal agency. County boundaries are from Census TIGER/Line, published for statistical purposes only: they are not a determination of jurisdictional authority or legal land descriptions. For legal or tax purposes, confirm your county with the county.