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 Reservation A type of functioning MCD equivalent found in Maine and New York, consisting of an American Indian reservation recognized by the Federal government or a State government; the reservation is independent of any other MCD. See also American Indian reservation.

Reserve (American Indian) A type of American Indian reservation.

Retail trade (census) See economic censuses.

Road district A type of functioning MCD found in Potter County, Pennsylvania, originally established to maintain roads, that has become a general-purpose government.

Rural The population and territory outside any UA and the urban part of any place with a decennial census population of 2,500 or more. See also extended city, place, urban, urban area, urban place, urbanized area.

Rural address An address consisting of a delivery route number and a box number, both assigned by the local post office for delivery of mail at a specific physical location. RR (rural route) is the most frequent route designation; also possible are HC (highway contract), RD (rural delivery), RFD (rural free delivery). See also address, city-style address, general delivery address, post office address.

Rural place Any incorporated place or CDP located outside a UA and having fewer than 2,500 residents in the most recent decennial census. See also census designated place, incorporated place, urban place.

SAC See Statistical Areas Committee.

Sample A statistical subset of the total population, used to estimate information about the population; to statistically select a subset of the total population, for the purpose of estimating information about that population. See also census, sample data, survey. G-42Glossary