The National Archives finished the scanning of the 1891 Census this summer and today close to 2,5 million images are available in the Digital Archives.
The 1891 Census consists of one sheet per person and one sheet per house/residence. These sheets have all been scanned and published in ordered series for the 559 cities and municipalities (herred) that existed in Norway at the time of the census.
Apart from name and occupation, most of the information in the census sheets is in printed letters. You need to access the information from the house lists. In these lists you will find reference to the person lists.
For Kristiania/Oslo, the address book of 1891 is scanned and available to simplify the information retrieval.