New Castle County DE Information


New Castle County Subdivisions

New Castle County DE Data & Demographics (As of July 1, 2020)


Total Population 570,346 (100%)
Population in Households 552,872 (96.9%)
Population in Families 440,326 (77.2%)
Population in Group Quarters1 17,474 ( 3.1%)
Population Density 1,338
Diversity Index2 65


Median Household Income $69,829
Average Household Income $94,950
% of Income for Mortgage4 16%
Per Capita Income $35,796
Wealth Index5 111


Total HU (Housing Units) 228,621 (100%)
Owner Occupied HU 142,678 (62.4%)
Renter Occupied HU 71,655 (31.3%)
Vacant Housing Units 14,288 ( 6.2%)
Median Home Value $271,286
Average Home Value $310,245
Housing Affordability Index3 147


Total Households 214,333
Average Household Size 2.58
Family Households 140,231
Average Family Size 3
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  2. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different races or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.


2010-2020 2020-2025
Population 0.56% 0.57%
Households 0.55% 0.57%
Families 0.39% 0.47%
Median Household Income   1.54%
Per Capita Income   1.72%
Owner Occupied HU   0.48%


New Castle County DE - Peer Comparisons by Rank and Percentile

The table below compares New Castle County to the other 3 counties and county equivalents in Delaware by rank and percentile using July 1, 2020 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 1 100th
Population Density # 1 100th
Median Household Income # 1 100th
Housing Affordability Index # 3 100th
Per Capita Income # 1 100th
Diversity Index # 1 100th

Additional comparisons and rankings can be made with a VERY EASY TO USE Delaware Census Data Comparison Tool.

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