Census Urbanized Areas (1990)

A Urbanized Area (UA) is a continuously built-up area with a population of 50,000 or more. It comprises one or more places—central place(s)—and the adjacent densely settled surrounding area—urban fringe—consisting of other places and nonplace territory. Source: Census.gov Note: Lawrence County was not part of the Southwestern Pennsylvania Commission region in 1990.城市化区域（Urbanized Area，UA）是指人口不少于50000的连片建成区。其包含一个或多个居民点（核心居民点），以及毗邻的高密度聚居外围地带——城市边缘区（urban fringe），该外围地带由其他居民点与非居民点地域组成。数据来源：美国人口普查局（Census.gov）。备注：1990年，劳伦斯县未纳入宾夕法尼亚州西南部委员会（Southwestern Pennsylvania Commission）的管辖范围。