Delaware Gazetteer

Delaware - Basic Information

Became a State: December 7, 1787 - 1st State
Population: 897,934 (2010 Census) - Ranks 45th
Land Area: 1,948.5 square miles - Ranks 49th
Population Density: 460.8 persons per square mile - Ranks 6th
Housing Units: 405,885 (2010 Census)
Housing Unit Density: 208.3 housing units per square mile
July 1, 2015 Estimates: Delaware Data and Demographics
State Capital: Dover
State Website: Official State of Delaware Website
Delaware State Flag
Delaware state flag

Delaware History


The area of Delaware was part of the original territory of the United States. Included in the grant to William Penn, the Three Lower Counties (Delaware) were annexed as part of the grant establishing the Province of Pennsylvania in 1683. The counties were granted a separate charter providing semi-autonomy in 1701, with generally the same boundary as the present state. In 1776, Delaware declared itself a separate government. Delaware ratified the U.S. Constitution on December 7, 1787; it was the first of the original 13 states to join the Union.

Census data for Delaware are available beginning with the 1790 census.

Delaware Geographical Areas

See: Geographic Terms & Concepts

Counties & County Equivalents

Interactive Map of Delaware Counties | Static Overview Map of Delaware Counties

There are three counties in Delaware.  Kent County’s governing body is the levy court.  New Castle and Sussex counties’ are each governed by a county council.

County Subdivisions

There are 27 county subdivisions in Delaware. They are all census county divisions (CCDs), which are delineated for statistical purposes, have no legal function, and are not governmental units.

Places (Incorporated Cities, Towns & Census Designated Places (CDPs))

Delaware has 78 places; 57 incorporated places and 19 census designated places (CDPs).  The incorporated places consist of 10 cities, 44 towns, and 3 villages.

Alphabetical List of Cities, Towns, CDPs and Other Populated Places
A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q, R | S | T | U, V | W, X, Y, Z

Neighborhood Data

Address Based Hyperlocal Data Input an address and get data & demographics for the pertinent census block group (CBG), a searchable map and a customized directory. The CBG is the smallest geographical unit used by the Census Bureau for reporting certain data.

Delaware Civil Features

Delaware Civil Features: Political Subdivisions, Native Areas, Land Grants, etc. - sorted by Census Class Codes.

Metropolitan and Micropolitan Stastical Areas

There are 1 Metropolitan and 0 Micropolitan Statistical Areas in Delaware. DE Metopolitan & Micropolitan Areas

Delaware ZIP Code Tabulation Areas

There are 68 ZIP Code tabulation areas (ZCTAs) in Delaware. View Delaware ZIP Codes and ZIP Code Maps.

School Districts

Delaware has 16 unified school districts. View Delaware Public and Private Schools.

Congressional Districts

Delaware has 1 congressional districts. An interactive map shows the contact information for each Representative as well as the boundaries for each Delaware district. View Map of Delaware Congressional Districts.

State Legislative Districts

There are 21 state senate districts and 41 state house districts in Delaware. 

American Indian Areas

Delaware has two state designated tribal statistical areas (SDTSAs).

Other Information Of General Geographic Interest

The northern boundary between the State of Delaware and the Commonwealth of Pennsylvania is known as the Twelve-Mile Circle.  The boundary is a circular arc forming a twelve-mile radius centered at the cupola of the courthouse in the town of New Castle, DE.

Delaware Physical, Cultural and Historic Features

  1. Delaware Physical Features such as lakes, islands, streams, valleys, summits, etc.
  2. Delaware Cultural Features such as schools, churches, hospitals, parks, dams, reservoirs, etc.
  3. Delaware Historical Features and Delaware Historic Landmarks

Delaware Maps

  • To find a ZIP Code: input the address in the top-left search box of any ZIP Code Map.
  • To find the County: input the address in the top-left search box of the interactive DE map.
  • To find the School Attendance Zone: input the address in the top-left search box of any DE school map

Delaware Census Data Comparison Tool

Compare Delaware Census Data
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