This section covers the relationship between municipalities and their codes by provinces, updated to 1 January 2010. A section also appears with the modifications registered in the municipalities dictionary between 01-01-2009 and 01-01-2010.

The denominations of municipalities and provinces that appear here are those that feature in the Ministry of Public Administration register of local institutions, the National Institute of Statistics being the Institution responsible for assigning the corresponding codes.

The present relationship is updated every year referred to 1 January.

The municipal code is made up of six digits: the first two correspond to the province code and the remaining four to the code within this. Of these four,the last one is a control digit, assigned via a calculation rule. It facilitates the detection of recording and coding errors.