Local, state and national governments are great resources for maps. Many different government offices use maps on a daily basis. Map types include tax, school district, political boundary (city, township, county, etc...), census, soil and water, topographic, nautical, etc... A couple of specific offices that might have the map you need are the auditor, taxation, engineer, tourism, police or sheriff and board of elections. The links below are primarily national government sites, but most states and counties have websites with online maps or information on getting a physical map.