• Spanish Central Tax authority
• Barcelona City Council
• Other Councils
• Other City and Town Councils with management delegated to the Barcelona Provincial Council
• Barcelona Activa
• BOE
• BOPB
• Land registry
• Dirección General de Tributos – Search engine for answers to tax queries
• Directorate-General for Traffic
• Barcelona City Council Municipal Gazette
• Generalitat de Catalunya – Department of Economy and Knowledge
• Urban Habitat – Barcelona City Council
• Ministry of Finance and Public Administration
• General State Administration portal
• Catalan Traffic Service
• Catalan Tributes