Largest municipalities by area

The 20 municipalities in Iwate Ken with the highest area, and the 20 with the lowest, out of 35 with a published figure.

	Municipality	Prefecture	Postal code	Area
1	Nagasaki Prefecture	Iwate Ken	028-1351	4,105.5 km²
2	Miyako	Iwate Ken	027-0301	1,259.2 km²
3	Ichinoseki	Iwate Ken	021-0867	1,256.4 km²
4	Ōshū-shi	Iwate Ken	023-1115	993.3 km²
5	Iwaizumi	Iwate Ken	027-0501	992.4 km²
6	Hanamaki	Iwate Ken	025-0244	908.4 km²
7	Morioka	Iwate Ken	020-0833	886.5 km²
8	Hachimantai	Iwate Ken	028-7564	862.3 km²
9	Tōno-shi	Iwate Ken	028-0531	826.0 km²
10	Kuji	Iwate Ken	028-0063	623.5 km²
11	Nishiwaga	Iwate Ken	029-5500	590.7 km²
12	Ōmachi-shi	Iwate Ken	028-1112	565.1 km²
13	Kamaishi	Iwate Ken	026-0041	440.4 km²
14	Kitakami	Iwate Ken	024-0076	437.6 km²
15	Ninohe	Iwate Ken	028-6868	420.4 km²
16	Iwate	Iwate Ken	020-0554	360.5 km²
17	Sumita	Iwate Ken	029-2300	334.8 km²
18	Ōfunato	Iwate Ken	022-0211	322.5 km²
19	Yamada	Iwate Ken	028-1321	262.8 km²
20	Shiwa	Iwate Ken	028-3448	239.0 km²

Smallest municipalities by area

	Municipality	Prefecture	Postal code	Area
1	Ando	Iwate Ken	028-1105	4.3 km²
2	Arakawa	Iwate Ken	028-1303	10.2 km²
3	Nakamura-ku	Iwate Ken	028-8334	16.3 km²
4	Nakayama	Iwate Ken	028-8344	31.1 km²
5	Ōkawa-shi	Iwate Ken	028-2232	33.6 km²
6	Kitayama	Iwate Ken	028-8402	48.2 km²
7	Hiraizumi	Iwate Ken	029-4192	63.4 km²
8	Fudai	Iwate Ken	028-8335	69.7 km²
9	Nagashima	Iwate Ken	029-4101	116.2 km²
10	Kunohe	Iwate Ken	028-7901	134.0 km²
11	Tanohata	Iwate Ken	028-8400	156.2 km²
12	Kanegasaki	Iwate Ken	029-4500	179.8 km²
13	Takizawa	Iwate Ken	020-0690	182.5 km²
14	Otsuchi	Iwate Ken	028-1131	200.4 km²
15	Rikuzentakata	Iwate Ken	029-2205	231.9 km²
16	Shiwa	Iwate Ken	028-3448	239.0 km²
17	Yamada	Iwate Ken	028-1321	262.8 km²
18	Ōfunato	Iwate Ken	022-0211	322.5 km²
19	Sumita	Iwate Ken	029-2300	334.8 km²
20	Iwate	Iwate Ken	020-0554	360.5 km²

Largest municipalities by area — 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.