Maps showing census records that have been transcribed for Denmark: http://www.dis-danmark.dk/kipkort/fronta-e.php
CENSUS
Description of the Census records for Denmark and Schleswig: Wiki.dis-danmark.dk
Census index for Denmark can be found at: http://www.ddd.dda.dk/ddd_en.htm. Not every census in Denmark has been indexed at this time. It is an ongoing project. The maps site listed above helps see the progress.
Census record indexes by parish are available on Danish Family Search.
Census record indexes for individual parishes can be accessed at this link. Transcriptions by Aurelia Clemmons.
The following guide will help you access manuscript census records online available on the archives site: https://familysearch.org/learn/wiki/en/images/c/cc/Arkivalieronline_Digitized_Census_Records_guide.pdf.