The 2 largest cities in Idaho are Boise with a population of  145,987 and Nampa with 81,557. The next 3 largest cities are  Meridian with 75,092, Idaho Falls with 56,813 and â¦ Pocatello with  54,255.
Averages for Washington DC in September. The weather in September in Washington DC is very attractive for those that want to avoid the peak heat of summer, yet still enjoy lots of warm days on their visit. On average, peak temperatures during the day in September still reach up to 27Â°C.
Washington DC is a single city that is also a federal district. There is no capital of DC, Washington DC is itself the Capital of the US.    Washington DC is a Federalâ¦ District that was created in 1790. Originally the 100 square miles included the towns of Washington, Georgetown and Alexandria.