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.
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.
Interactive Map of Delaware Counties | Static Overview Map of Delaware Counties
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)
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.
Delaware has 16 unified school districts. View Delaware Public and Private Schools.
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.