Spanish overseas voters could shift up to 23 parliamentary seats

A report by the consultancy De Madrid a Europa reveals that the Spanish overseas electorate has grown significantly, potentially impacting the distribution of seats in future general elections. As of July 1, 2026, the Census of Absent Residents (CERA) includes 2,736,522 electors, representing 7.11% of the total Spanish electorate—a tenfold increase since 1986.

If overseas voters reached historically maximum participation levels in every province, their votes could potentially shift up to 23 seats across Spain's 52 constituencies. Even when applying historical average participation rates, the study suggests the overseas vote could influence up to 16 seats.

The growth is largely attributed to the 2022 ‘law of grandchildren,’ which facilitated the naturalization of descendants of Spanish emigrants, particularly in Latin America. Currently, 158 Spanish municipalities have more registered voters living abroad than within the country. The Americas host 63.4% of the overseas census, led by Argentina, while Europe accounts for 33.5%. Major concentrations of these voters are found in Mexico, the United States, and the United Kingdom.