Most densely populated municipalities

The 20 municipalities in Gumma Ken with the highest people per km², and the 20 with the lowest, out of 37 with a published figure.

	Municipality	Prefecture	Postal code	People per km²
1	Ota	Gumma Ken	373-0054	11,917.0 /km²
2	Kusatsu	Gumma Ken	377-1711	2,111.9 /km²
3	Kawai	Gumma Ken	370-1117	2,063.5 /km²
4	Isesaki	Gumma Ken	372-0057	1,508.4 /km²
5	Tamamura	Gumma Ken	370-1100	1,398.0 /km²
6	Tatebayashi	Gumma Ken	374-0046	1,213.6 /km²
7	Yoshioka	Gumma Ken	370-3600	1,066.7 /km²
8	Maebashi	Gumma Ken	371-0833	1,065.0 /km²
9	Ōra-machi	Gumma Ken	370-0701	823.6 /km²
10	Takasaki	Gumma Ken	370-0873	811.6 /km²
11	Otsu	Gumma Ken	377-1308	738.2 /km²
12	Tone	Gumma Ken	379-1305	604.8 /km²
13	Iizuka	Gumma Ken	370-1102	589.5 /km²
14	Shintō-mura	Gumma Ken	370-3500	508.3 /km²
15	Kiryū	Gumma Ken	376-0054	385.3 /km²
16	Tano	Gumma Ken	370-1600	384.2 /km²
17	Tomioka	Gumma Ken	370-2393	382.0 /km²
18	Goka	Gumma Ken	370-1128	351.6 /km²
19	Fujioka	Gumma Ken	375-0034	347.3 /km²
20	Nakayama	Gumma Ken	377-0702	340.8 /km²

Most sparsely populated municipalities

	Municipality	Prefecture	Postal code	People per km²
1	Mishima	Gumma Ken	377-0813	0.0 /km²
2	Mihara	Gumma Ken	377-1526	16.2 /km²
3	Tsumagoi	Gumma Ken	377-1500	26.9 /km²
4	Nakanojō	Gumma Ken	377-0400	34.6 /km²
5	Naganohara	Gumma Ken	377-1304	37.5 /km²
6	Takayama	Gumma Ken	377-0700	39.1 /km²
7	Higashiagatsuma	Gumma Ken	377-0800	48.7 /km²
8	Numata	Gumma Ken	378-0063	101.8 /km²
9	Fujikawa	Gumma Ken	370-1101	125.1 /km²
10	Uenohara	Gumma Ken	370-3505	132.2 /km²
11	Annaka	Gumma Ken	379-0135	197.6 /km²
12	Akaiwa	Gumma Ken	377-1311	202.2 /km²
13	Kanra	Gumma Ken	370-2613	214.4 /km²
14	Midori	Gumma Ken	376-0303	236.0 /km²
15	Shima	Gumma Ken	377-0601	256.1 /km²
16	Nagaoka	Gumma Ken	370-3501	298.4 /km²
17	Shibukawa	Gumma Ken	377-0294	304.1 /km²
18	Nakayama	Gumma Ken	377-0702	340.8 /km²
19	Fujioka	Gumma Ken	375-0034	347.3 /km²
20	Goka	Gumma Ken	370-1128	351.6 /km²

Most densely populated municipalities — All of Japan

One row per municipalities. The figures are published by municipality, so every postal code inside one shares them; the postal code shown is one of that municipality's.