Geographic Levels
Independent Cities in Maryland, Missouri, Nevada and Virginia Islands in the U.S. Virgin...incorporated municipalities (cities, towns, villages and boroughs) with 2,500 or more inhabitants
https://www.census.gov/programs-surveys/economic-census/guidance-geographies/levels.html
Census Survey Explorer
...refer to most cities, some towns, villages and boroughs. A concentration of population...identified as a census designated place (CDP) including comunidades and zonas urbanas
https://www.census.gov/data/data-tools/survey-explorer/geo.html
Census 2000 pl 94 171 techdoc
...andMunicipioinPuertoRico;inMaryland,Missouri, Nevada,andVirginia,oneormorecitiesareinde...Puerto Rico; in Maryland, Missouri, Nevada, and Virginia, one or more cities are
https://www.census.gov/content/dam/Census/programs-surveys/rdo/TechnicalDocumentation/Census2000_pl94-171_techdoc.pdf