New Castle County Population 2018

New Castle County's estimated population is 559,793 with a growth rate of 0.35% in the past year according to the most recent United States census data. New Castle County is the 1st largest county in Delaware.

Year Population Growth Growth Rate
2017559,7931,9420.35%
2016557,8512,2640.41%
2015555,5873,1220.57%
2014552,4652,9790.54%
2013549,4863,3660.62%
2012546,1203,8380.71%
2011542,2823,4510.64%
2010538,83196,88521.92%
1990441,94643,83111.01%
1980398,11512,2593.18%
1970385,85678,41025.50%
1960307,44688,56740.46%
1950218,87939,31721.90%
1940179,56218,53011.51%
1930161,03212,7938.63%
1920148,23925,05120.34%
1910123,18813,49112.30%
1900109,69712,51512.88%
189097,18219,46625.05%
188077,71614,20122.36%
187063,5158,71815.91%
186054,79712,01728.09%
185042,7809,66029.17%
184033,1203,40011.44%
183029,7201,8216.53%
182027,8993,47014.20%
181024,429-932-3.67%
180025,3615,67328.81%
179019,6880.00%

New Castle County Population Growth

Population Data via

New Castle County Race Data

Race Population Percentage
White369,23165.96%
Black or African American139,78824.97%
Asian30,2345.40%
Two or More Races13,2682.37%
American Indian and Alaska Native2,2690.41%
Native Hawaiian and Other Pacific Islander3770.07%

New Castle County Population Pyramid

0k5k10k15k20k Male Population0k5k10k15k20k Female Population8580757065605550454035302520151050
Data Sources
  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990