County (United States) - Wikipedia
https://en.wikipedia.org/wiki/County_(United_States)
OverviewGeographic relationships between cities and countiesHistoryCounty variationsNames and etymologiesCounty governmentStatisticsSee alsoIn some states, a municipality may be in only one county and may not annex territory in adjacent counties, but in the majority of states, the state constitution or state law allows municipalities to extend across county boundaries. At least 32 states include municipalities in multiple counties. Dallas, for example, contains portions of five counties, while numerous other cities comprise portions of four counties. New York City is an unusual case because it encompasses multiple ent…
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