Dutch Election Swing

The big story of the 2025 Dutch general elections so far is the resurgence of the Christian Democrats (CDA) in the polls. Having dropped from 15 MPs to just 5 in the last general election in 2023 (out of a total of 150 seats in parliament), the party is currently polling at the highest levels since they last led the Dutch government in 2010.

While the CDA is currently not expected to become the biggest party in this year’s general election (the Dutch political system is messy!), there’s significant ground for the party to gain in areas of the country where they lost support during the last elections. Depending on the outcome, there’s significant potential for them to be a key player in the formation of the next government in the Netherlands.

In this map we take a closer look at the swing in CDA votes between the 2023 and 2021 general elections, based on data at the polling station level. ‘Swing’ is calculated based on the change in voter support as a proportion of the total vote in an area and is usually expressed as a positive or negative percentage.

As you can see, the areas with higher swing have a darker colour on the map and will likely be key focus areas for the CDA’s local campaigning efforts!

To make this map, we used the following Honeycom Maps features:

• Point Layer to show polling locations with interactive tooltips
• H3 Layers to show heatmaps of Swing Percentage Change and Number of Votes - these were created automatically from underlying the point data
• Polygon layer to show province boundaries
• Big Number components to show aggregated totals of polling places, valid votes, and average swing
• Polygon filter to allow for cross-filtering for a specific area

Data is from the Open State Foundation. It was converted from GeoJSON to CSV using our free converter tool, and then imported to Honeycomb Maps. The map is stored on Google Drive and shared publicly.