A "--" in the district column means, that the town is a district-free town, i.e. it is by itself a district.
... March 1 - Glenn Miller, bandleader (+ 1944) March 2 - Dr. Seuss, author (+ 1991) March 8 - Victor de Kowa[?], actor (+ 1973) March 6 - Joseph Schmidt[?], tenor ...