On municipal level the religious majority is reflected by the colour used: red for Protestant, green for Catholic. When this majority reaches 66.66% (2/3 of the population) or above, a dark colour is shown; lies the majority between 50.0% and 66.66%, so a bright colour is shown. 7 municipalities are shown in blue, which means no majority exists there. In 6 of them, the share of both groups is almost or just even: Avenhorn (NH), Mijdrecht (Ut), Oegstgeest (ZH), Oudwulven (Ut), Portengen (Ut) and Stad Delden (Ov). The municipality of Tempel (ZH) is unpopulated and therefore coloured blue as well.

In addition, religious enclaves are shown, all Catholic in Protestant area, as far as they don't appear from the (brighter) colour of the municipality. Considered as an enclave are villages or a group of villages / hamlets with a majority of one religion, entirely surrounded by other religious area. 13 enclaves meet this definition: in Groningen Kloosterburen / Den Hoorn; in Friesland Bakhuizen, en:Blauwhuis, Buren (island of Ameland), Roodhuis and Sint Nicolaasga; in Drenthe De Maten, Nieuw-Schoonebeek, Steenwijksmoer, Zandberg and Zorgvlied; in Overijssel Slagharen; in Zuid-Holland Achthuizen (island of Goeree-Overflakkee). Villages indeed differing in religion within the municipality, but neighbouring an area of the same religion, are not shown. An exception is made for the Catholic enclaves of Nieuw-Schoonebeek en De Maten, neighbouring the Catholic region of Emsland in Germany, which are shown because this German region is not included on the map. After 1849, more Catholic villages were founded in the peat reclamation area of Southeast Drenthe, mainly by German immigrants: Barger-Compascuum, Barger-Oosterveld, Klazienaveen-Noord, Weiteveen and Zwartemeer.

All in all the census data of 1849, especially with secularisation not present yet, gives a good survey of the religious background of different parts of the Netherlands. The religious 'border' between the Protestant and Catholic half of the country, following a line from the southwest to the east, can be clearly seen. This border can be dated back mainly to the truce line during the Twelve Years' Truce (1609 - 1621). On the other hand, the mixed religious background of large parts of the Holland and Utrecht provinces becomes clear. The Catholics here, as in the enclaves, derive from those retaining to the 'old faith' during the Reformation era.

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