Manilla is a city in Crawford County, Iowa, United States, along the West Branch of the West Nishnabotna River. The population was 775 at th…Manilla is a city in Crawford County, Iowa, United States, along the West Branch of the West Nishnabotna River. The population was 775 at the time of the 2020 United States census. Manilla is working to bolster its declining population by providing free land and property tax abatements to attract new residents.