| 1/ | Total earnings less personal contributions for social insurance adjusted to place of residence. | |
| 2/ | Includes supplemental security income payments, payments to families with dependent children (AFDC), general assistance payments, food stamp payments, and other assistance payemnts, including emergency assistance. | |
| 3/ | Census Bureau midyear population estimates. Estimates for 1990-96 reflect county population estimates available as of October 1995. | |
| 4/ | Type of income divided by population yields a per capita for that type of income. | |
| 5/ | Excludes limited partners. | |
| 6/ | Cibola, NM was separated from Valencia in June 1981, but in these estimates, Valencia includes Cibola through the end of 1981. | |
| 7/ | La Paz county, AZ was separated from Yuma county on January 1, 1983. | |
| 8/ | Estimates for 1979 forward reflect Alaska Census Areas as defined in the 1980 Decennial Census; those for prior years reflect Alaska Census Divisions as defined in the 1970 Decennial Census. Estimates from 1988 forward separate Aleutian Islands Census Area Into Aleutians East Borough and Aleutians West Census Area. Denali and Lake + Peninsula Boroughs begin in 1991. Estimates from 1993 forward separate Skagway-Yakutat-Angoon Census Area into Skagway-Hoonah-Angoon Census Area and Yakutat Borough. | |
| B | Less than $50,000 or less than 10 jobs, as appropriate. Estimates are included in totals. | |
| I | Data not available for this year. |