Douglas County Planning Department handles unincorporated areas, while the City of Omaha and other incorporated municipalities manage their own building permits and zoning enforcement. The county maintains jurisdiction over rural zoning and land use, while urban development is heavily decentralized among municipal authorities.
How this fits with the state
The state authority here is Nebraska Department of Labor; Nebraska state trade boards. The county file does not replace that — it adds the permit office, local overlays, and the actual filing path.