American Indian areas (AIAs) include federally recognized American Indian reservations, American Indian off-reservation trust land, and American Indian tribal subdivision boundaries. AIA maps can be found by opening the American Indian areas link on the maps page.

The file naming convention for AIAs is as follows:  BAS25R499<tribal code><tribal area code>.pdf, where <tribal code> represents the four-digit tribal code, and <tribal area code> represents the four-digit tribal area code. An example of an AIA file name is:  BAS25R49900090495.pdf.

Hawaiian Home Lands (HHLs) are areas created and held in trust for the benefit of Native Hawaiians by the state of Hawaii, pursuant to the Hawaiian Homes Commission Act of 1920, as amended. HHL maps can be found by opening the Hawaiian Home Lands link on the maps page.

The file naming convention for HHLs is as follows: BAS25R499<yyyy><zzzz>.pdf,
where <yyyy> represents the four-digit HHL state office code, and <zzzz> represents the four-digit HHL code. An example of a HHL file name is: BAS25R49903035026.pdf.

Consolidated cities are a type of incorporated place that contains one or more other incorporated places that continue to function as separate governments within a consolidated government. Consolidated city maps can be found by opening the link to the state of your interest and then opening the link to the list of consolidated cities for that state.

The file naming convention for consolidated cities is as follows: BAS25CC0<st>000<yyyyy>.pdf, where <st> represents the two-digit state code, and <yyyyy> represents the five-digit consolidated city FIPS code. An example of a consolidated city file name is: BAS25CC00900047500.pdf.

Counties are the primary legal division of states except in the states of Alaska, Connecticut, Louisiana, and Puerto Rico. In Alaska, census areas and boroughs are recognized by the Census Bureau as a county equivalent. In Connecticut, planning regions are recognized by the Census Bureau as a county equivalent. In Louisiana, parishes are recognized by the Census Bureau as a county equivalent. In Puerto Rico, the Census Bureau recognizes municipios as the county equivalent. County maps can be found by opening the link to the state of your interest, and then opening the link to the list of counties in that state.

The file naming convention for counties and county equivalent areas is as follows: BAS25C2<st><cou>00000.pdf, where <st> represents the two-digit state FIPS code, and <cou> represents the three-digit county FIPS code. An example of a county file name is: BAS25C2020200000.pdf.

Incorporated places are incorporated under state law as a city, city and borough, town, municipality, borough, or village that has legally prescribed limits, powers, and functions. Incorporated place maps can be found by opening the link to the state of your interest, and then opening the link to the list of counties in that state.

The file naming convention for incorporated places is as follows: BAS25P1<st>000<place>.pdf, where <st> represents the two-digit state FIPS code, and <place> represents the five-digit place FIPS code. An example of an incorporated place file name is: BAS25P10600000947.pdf.

Minor Civil Divisions (MCDs) are the primary government or administrative divisions of counties and county equivalent areas in 29 states. MCDs represent many kinds of legal governments with a wide variety of government and/or administrative functions. MCDs are variously designated as American Indian reservations, assessment districts, boroughs, charter townships, election districts, election precincts, gores, grants, locations, magisterial districts, parish governing authority districts, plantations, precincts, purchases, road districts, supervisors’ districts, towns, and townships. MCD maps can be found by opening the link to the state of your interest, and then opening the link to the list of MCDs in that state. These maps are only created for MCDs with active, functioning governments, which exist in 20 of the 29 MCD states.

The file naming convention for MCDs is as follows: BAS25M3<st><cou><MCDcd>.pdf, where <st> represents the two-digit state FIPS code, <cou> represents the three-digit county FIPS code, and <MCDcd> represents the five-digit MCD FIPS code. An example of a MCD file name is: BAS25M31700123412.pdf.