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, 2014 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

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.  CCDs were first established in Delaware for the 1970 census.  Prior to 1970, the minor civil divisions used in the census included (State) representative districts and hundreds.

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

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

For the 111th Congress (January 2009-January 2011), Delaware had one congressional district.  For the 113th Congress (January 2013-January 2015), Delaware continues to have one congressional district as a result of reapportionment based on the 2010 Census. 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 Selected Delaware Census Data Data: Population,   Population Density,   Diversity Index,   Median Household Incomes,   Per Capita Income
Locations: Cites & Towns,   Counties,   ZIP Codes
Highest or Lowest: Show Highest Values,   Show Lowest Values
Results: Show 20 Results,   Show 200 Results
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