The list of county secession proposals in the United States includes proposed new counties to be formed from existing counties within a given state that have not yet been formed. For counties that want to secede from their current state and to join or create another, see List of U.S. state partition proposals. Alabama Perdido County, Alabama would contain northern Baldwin County, divided by a straight line extending westward from the northwestern tip of Florida, and western Escambia County, west of Big Escambia Creek. (The Flomaton area is excluded via a prominent power line easement, from Big Escambia Creek to the Florida state line.) The southwestern tip of Conecuh County, also west of Big Escambia Creek, may be included as well. The headwaters of the Perdido River rise near the center of this proposed county. The Perdido County seat would be Atmore. The county has been proposed by city of Atmore backers, who believe that their growing city of over 10,000 residents should be a county seat. Furthermore, county backers believe that Atmore belongs in the Mobile-Daphne-Fairhope metropolitan combined statistical area, which would become much more likely within its own exurban-leaning county. Brewton would remain the county seat of rural-leaning Escambia County. In addition to the incorporated city of Atmore, Perdido County would include the unincorporated communities of Blacksher, Canoe, Freemanville, Huxford, Nokomis, Perdido and Tensaw. Alaska Chugiak and Eagle River are communities along the Glenn Highway between Anchorage and the Matanuska-Susitna Valley. Originally farming and homesteading communities with a distinct identity, they became better known starting in the 1970s as bedroom communities of Anchorage, and are currently located within its city limits (see below). In the wake of the incorporation of the Greater Anchorage Area Borough (in 1964) and subsequent efforts to merge the GAAB with Anchorage's city government (which began in 1966), Chugiak and Eagle River residents began their own efforts to attempt to secede from the GAAB. The culmination of these efforts, the Chugiak-Eagle River Borough, incorporated on August 27, 1974 with an area of and an estimated population of 5,832, before the incorporation was invalidated by the Alaska Supreme Court on April 14, 1975. Five months later, the reconstituted GAAB and existing cities within its boundaries merged to form the Municipality of Anchorage. The population of Eagle River increased greatly during the 1980s and 1990s. This has led to renewed discussion during the 21st century on