Separate certificate for each city.

Iowa Code § 462A.41, under WATER NAVIGATION REGULATIONS.

Iowa Code § 462A.41

If a manufacturer or dealer has an established place of business in more than one city, the manufacturer or dealer shall secure a separate and distinct special certificate and general distinguishing number for each such place of business. [C71, 73, 75, 77, 79, 81, §106.41 ] C93, §462A.41