First-level division
🇳🇴 Østfold
Ostfold fylke
Subdivisions
Fredrikstad
Population 83,761
Sarpsborg
Population 56,559
Moss
Population 49,668
Indre Ostfold
Population 46,456
Halden
Population 31,387
Rakkestad
Population 7,496
Rade
Population 6,790
Valer
Population 5,335
Hvaler
Population 3,998
Skiptvet
Population 3,492
Marker
Population 3,455
Aremark
Population 1,420