What’s your apartment number? The apartment number is a 4 digit number. First two digits describes the floor level and the two last digits the position on the floor. The numbering within eatch floor starts with 01 for the apartment to the left of the stairway walking upwards the stairs. The numbering count then goes clockwise with 02, 03 etc. At Varvsgatan 2 we also use the old apartment numbering system, that number can be found on the monthly rental note. Folkbokföringsregistrets system for apartment numbering calculation.