Mullers Grosses Deutsches Ortsbuch 2017: Vollstandiges Ortslexikon

The most comprehensive and detailed index of place names in Germany provides an extraordinary amount of information:

• over 136,000 place names, not only including independent towns and municipalities but also over 100,000 otherwise undocumented small and very small villages, settlements, small settlement areas, farms, hamlets, etc.
• their affiliation with local administrative bodies (town or municipality) along with their respective communal codes
• number of inhabitants, area, dialing code, geographical coordinates, height above sea level and UN/LOCODE
  

The respective responsible federal, state and communal authorities as well as the appropriate jurisdiction for all places in Germany:

• administrative associations, associations of communities, communities
  county, regional administrative district, state (Land)
• general jurisdiction, courts dealing with employment, financial, and social matters, administrative court
• furthermore: registry offices, financial and tax administration, social security/pension offices, public health departments, trade supervisory offices, job centers/unemployment offices, chambers of industry and commerce, customs offices, "Point of Single Contact" according to EU Service Directive