present time; however, the 1,000 population minimum outside of UAs has been constant, with the exception of Alaska, Hawaii, Puerto Rico, and places within American Indian reservations (see Table 9-5). Beginning with the 1970 census, the Census Bureau recognized as unincorporated places, the concentrated residential populations on and around military installations.
Table 9-5. Criteria for Qualification of CDPs From 1940 Through 1990
| 1940 | No official recognition of CDPs as places; unincorporated communities of 500 or more inhabitants were tabulated when separate figures could be compiled. |
| 1950 | Outside of UAs, unincorporated places of 1,000 or more inhabitants qualified as CDPs.
Inside UAs, only incorporated places were recognized. |
| 1960 | Outside of UAs, 1,000 or more inhabitants were required to qualify a place as a CDP.
Inside UAs, unincorporated places of 10,000 or more inhabitants were recognized as CDPs. No unincorporated places in New England UAs could be included in the UA. |
| 1970 | Outside of UAs, 1,000 or more inhabitants were required to qualify a place as a CDP.
Inside UAs, unincorporated places (excluding New England UAs) of 5,000 or more inhabitants were recognized as CDPs. |
| 1980 | Outside of UAs, 1,000 or more inhabitants were required to qualify a place as a CDP.
Inside UAs, CDPs were recognized if they had 5,000 or more inhabitants (in larger UAs), or 1,000 or more inhabitants (in smaller UAs). This was the first year the Census Bureau recognized CDPs inside New England UAs. |
| 1990 | Outside of UAs, 1,000 or more inhabitants (250 or more on American Indian reservations) were required to qualify a place as a CDP.
Inside UAs, CDPs were recognized if they had 2,500 or more inhabitants (a few if they had 1,000 to 2,499 inhabitants). |
Note: Since before 1950, the minimum unincorporated place/CDP size for Alaska (outside of UAs) has been 25 or more inhabitants; for Hawaii (both inside and outside of UAs) it has been 300 or more.
Places9-23
