Census information for 2000 shows the county's population grew by 30 percent to 142,361 from 109,303 in 1990 and 92,110 in 1980.
Every city in Imperial County gained in population.
Hispanics make up the lion's share of the county's 2000 population count and of every incorporated city, with 98,899, or 69.5 percent of the total population. In 2000 there were 28,728 whites, 5,624 blacks, 1,734 American Indians, 2,446 Asians, 75 Pacific Islanders and 97 listed as others.
Information for the county in 1990 shows 73,615 whites, 71,935 Hispanics, 2,622 black, 1,859 American Indian, 2,135 Asian and 29,072 so-called others. The white numbers in 1990 included Hispanics.
According to census data as compiled by The Associated Press, the county's diversity has steadily decreased when compared to the state's other 57 counties. For the 2000 census the county shows a diversity of 60.3 percent, or 25th in the state. In 1990, the county's diversity was shown as 53.6 percent, and ranked 16th, while in 1980 the county's diversity was 61.9 percent and the county ranked third.