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| C1 | An incorporated place that is governmentally active, is not related to an Alaska Native village statistical area (ANVSA), and does not serve as a minor civil division (MCD) equivalent. |
| C2 | Incorporated place that also serves as a minor civil division (MCD) equivalent because, although the place is coextensive with an MCD, the U.S. Census Bureau, in agreement with state officials, does not recognize that MCD for presenting census data because the MCD cannot provide governmental services (applies to Iowa and Ohio only). |
| C3 | Incorporated place that is a consolidated city. |
| C5 | Incorporated place that also serves as a minor civil division (MCD) equivalent because it is not part of any MCD or a county subdivision classified as Z5. |
| C6 | Incorporated place that coincides with or approximates an Alaska Native village statistical area (ANVSA). |
| C7 | An incorporated place that is an independent city; that is, it also serves as a county equivalent because it is not part of any county and a minor civil division (MCD) equivalent because it is not part of any MCD. |
| C8 | The portion ("balance") of a consolidated city that excludes the separately incorporated place(s) within that jurisdiction. |
| C9 | An incorporated place whose government is operationally inactive and is not included in any other C subclass. |
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| D1 | Federally recognized American Indian reservation (AIR) that has associated off-reservation trust land. |
| D2 | Federally recognized American Indian reservation (AIR) that does not have associated off-reservation trust lands. |
| D3 | Federally recognized American Indian off-reservation trust land area without any associated American Indian reservation (AIR). |
| D4 | State-recognized American Indian reservation (AIR). |
| D6 | A statistical entity for a federally recognized American Indian tribe that does not have a reservation or identified off-reservation trust land—specifically a Census 2000 tribal designated statistical area (TDSA), Census 2000 Oklahoma Tribal statistical area (OTSA), or a 1990 tribal jurisdiction statistical area (TJSA) but excluding Alaska Native village statistical areas. |
| D7 | Tribal Subdivision. |
| D9 | A statistical entity for a state recognized American Indian tribe not having a reservation specifically a state designated American Indian statistical area (SDAISA). |
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| E1 | Alaska Native Village Statistical Area (ANVSA) that does not coincide with, or approximate, an incorporated place or census designated place (CDP). |
| E2 | Alaska Native Village Statistical Area (ANVSA) that coincides with, or approximates, a census designated place (CDP). |
| E6 | Alaska Native Village Statistical Area (ANVSA) that coincides with, or approximates, an incorporated place. |
| E7 | An Alaskan Native Regional Corporation (ANRC). |
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| F1 | A Hawaiian home land, an area established by the Hawaiian Homes Commission Act of 1921 providing for lands held in trust by the State of Hawaii for the benefit of Native Hawaiians. |
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| H1 | An active county or statistically equivalent entity that does not qualify under subclass C7 or H6. |
| H4 | A legally defined inactive or nonfunctioning county or statistically equivalent entity that does not qualify under subclass H6. |
| H5 | Census areas in Alaska, a statistical county equivalent entity. |
| H6 | A county or statistically equivalent entity that is coextensive or governmentally consolidated with an incorporated place, part of an incorporated place, or a consolidated city. |
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| M2 | An installation (or part of an installation) of the U.S. Department of Defense or any branch thereof, or of the U.S. Coast Guard, that serves as a census designated place. |
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| T1 | Governmentally active minor civil division (MCD) that is not coextensive with an incorporated place. |
| T5 | Governmentally active minor civil division (MCD) that is coextensive with an incorporated place. |
| T9 | A minor civil division (MCD) whose government is inactive. |
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| U1 | Census designated place (CDP) with a name that is commonly recognized for the populated area, and designated as a populated place by the U.S. Geological Survey. |
| U2 | Census designated place (CDP) with a name that is not commonly recognized for the populated area (e.g., a combination of the names of two or three commonly recognized communities, or a name that identifies the location of the CDP in relation to an adjacent incorporated place). |
| U9 | A census designated place (CDP) that coincides with, or approximates, an Alaska Native Village Statistical Area (ANVSA). |
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| Z1 | A minor civil division (MCD) that cannot provide general-purpose governmental services. |
| Z2 | An American Indian reservation and/or off-reservation trust land area that also serves as a primary division of a county or statistical equivalent entity. |
| Z3 | Unorganized territory identified by the U.S. Census Bureau as a minor civil division (MCD) equivalent for presenting statistical data. |
| Z5 | Census county division (CCD), census subarea (Alaska only), or census subdistrict (U.S. Virgin Islands only). |
| Z6 | Subbarrio (sub-MCD) in Puerto Rico. |
| Z7 | An incorporated place that the U.S. Census Bureau treats as a minor civil division (MCD) equivalent because it is not in any MCD or is coextensive with a legally established but nonfunctioning MCD that the U.S. Census Bureau does not recognize for statistical data presentation purposes, AND is located in a county whose MCDs cannot provide governmental services (Iowa, Louisiana, Nebraska, and North Carolina only). |
| Z9 | A pseudo-minor civil division (MCD) that consists of water area not assigned to any legal MCD. |
