# Japan National Route 340

National Route 340 (国道340号, Kokudō Sanbyakuyonjūgō) is a national highway of Japan connecting the cities of Rikuzentakata, in southeastern Iwate Prefecture, and Hachinohe, in southeastern Aomori Prefecture. It travels south to north and has a total length of 246.2 kilometers (153.0 mi). It serves primarily as an alternate, inland route to National Route 45 through the northeastern part of the Tōhoku region.

## Route description

National Route 340 has a total length of 246.2 kilometers (153.0 mi).

## History

National Route 340 was established by the Cabinet of Japan in 1975 between Rikuzentaka and Hachinohe.

## Major intersections

All junctions listed are at-grade intersections unless noted otherwise.
| Prefecture | Location | km | mi | Destinations | Notes |
| Iwate | Rikuzentakata | 0.0 | 0.0 | National Route 45 (Rikuzentakata Bypass) – Kamaishi, Ōfunato, Ishinomaki, Kesennuma | Southern terminus of national routes 340 and 343 |
| Iwate | Rikuzentakata | 1.7 | 1.1 | Iwate Prefecture Route 141 east | Intersection is closed due to post-2011 Tōhoku earthquake and tsunami reconstruction work |
| Iwate | Rikuzentakata | 2.7 | 1.7 | Sanriku Expressway – Sendai, Kesennuma, Miyako, Kamaishi | Rikuzentakata Interchange (E45 exit 31) |
| Iwate | Rikuzentakata | 4.9 | 3.0 | National Route 343 west – Ōshū, Ichinoseki | Northern end of unsigned National Route 343 concurrency |
| Iwate | Sumita | 17.8 | 11.1 | National Route 107 east – Kamaishi, Ōfunato, Morioka, Kitakami, Tōno | Southern end of National Route 107 concurrency |
| Iwate | Sumita | 21.9 | 13.6 | National Route 107 west – Morioka, Kitakami, Ōshū | Northern end of National Route 107 concurrency |
| Iwate | Sumita | 27.4 | 17.0 | Iwate Prefecture Route 238 north | |
| Iwate | Sumita | 29.9 | 18.6 | Iwate Prefecture Route 167 east | |
| Iwate | Tōno | 38.2 | 23.7 | Kamaishi Expressway / National Route 283 east – Kamaishi | Tōno-Sumita Interchange (E46 exit 6); southern end of National Route 283 concurrency |
| Iwate | Tōno | 41.7 | 25.9 | National Route 283 east | Eastbound National Route 283 pedestrian, bicycle, or motorized traffic with engine displacement below 125cc traffic must use this road |
| Iwate | Tōno | 45.6 | 28.3 | Iwate Prefecture Route 35 east – to National Route 45, Unosumai, Hashino iron mining and smelting site | |
| Iwate | Tōno | 48.4 | 30.1 | National Route 283 west (Tōno Bypass) | Northern end of National Route 283 concurrency |
| Iwate | Tōno | 51.8 | 32.2 | Iwate Prefecture Route 160 west – Tsukimōshi | |
| Iwate | Miyako | 70.9 | 44.1 | Iwate Prefecture Route 26 (former National Route 340) east – Ōtsuchi | |
| Iwate | Miyako | 78.9 | 49.0 | Iwate Prefecture Route 25 west – Shiwa | |
| Iwate | Miyako | 86.0 | 53.4 | National Route 106 west – Morioka | Southern end of National Route 106 concurrency |
| Iwate | Miyako | 87.4 | 54.3 | Iwate Prefecture Route 143 south – Rikuchū-Kawai Station | |
| Iwate | Miyako | 101.5 | 63.1 | National Route 106 east – Miyako | Northern end of National Route 106 concurrency |
| Iwate | Iwaizumi | 129.6 | 80.5 | Iwate Prefecture Route 171 west – Okawa, Kamatsuda | |
| Iwate | Iwaizumi | 136.8 | 85.0 | National Route 455 east – Ryūsendō, Iwaizumi | Southern end of National Route 455 concurrency |
| Iwate | Iwaizumi | 147.7 | 91.8 | National Route 455 west – Morioka | Northern end of National Route 455 concurrency |
| Iwate | Kuzumaki | 160.9 | 100.0 | Iwate Prefecture Route 202 east – Fudai, Akka | |
| Iwate | Kuzumaki | 176.3 | 109.5 | National Route 281 west – Morioka, Iwate Town | Southern end of National Route 281 concurrency |
| Iwate | Kuzumaki | 177.3 | 110.2 | National Route 281 east – Kuji | Northern end of National Route 281 concurrency |
| Iwate | Kunohe | 190.7 | 118.5 | Iwate Prefecture Route 271 west – Anetai | |
| Iwate | Kunohe | 190.9 | 118.6 | Iwate Prefecture Route 272 east – Nikarube | |
| Iwate | Kunohe | 196.9 | 122.3 | Iwate Prefecture Route 5 east – Yamagata | Southern end of Iwate Prefecture Route 5 concurrency |
| Iwate | Kunohe | 199.8 | 124.1 | Iwate Prefecture Route 5 west – Ichinohe | Northern end of Iwate Prefecture Route 5 concurrency |
| Iwate | Kunohe | 200.5 | 124.6 | Iwate Prefecture Route 24 west – Ninohe | |
| Iwate | Kunohe | 202.8 | 126.0 | Hachinohe Expressway – Morioka, Hachinohe Iwate Prefecture Route 22 (Karumai Kunohe Route) east – Taneichi, Kuji ,Yamagata | Kunohe Interchange (E4A exit 3) |
| Iwate | Karumai | 209.4 | 130.1 | Iwate Prefecture Route 264 (Ninohe Karumai Route) – Natsumagi, Kiminarita | |
| Iwate | Karumai | 212.4 | 132.0 | National Route 395 west – Ninohe | Southern end of National Route 395 concurrency |
| Iwate | Karumai | 217.0 | 134.8 | Iwate Prefecture Route 33 north – Hachinohe, Nagawa | |
| Iwate | Karumai | 221.2 | 137.4 | Hachinohe Expressway – Morioka, Hachinohe, Misawa Iwate Prefecture Route 264 (Ninohe Karumai Route) south – Central Karumai | Karumai Interchange (E4A exit 4) |
| Iwate | Karumai | 221.3 | 137.5 | National Route 395 east – Kuji, Ōno | Northern end of National Route 395 concurrency |
| Aomori | Hachinohe | 231.3 | 143.7 | Aomori Prefecture Route 42 – Nanbu, Hashikami, Hachinohe Expressway | |
| Aomori | Hachinohe | 242.4 | 150.6 | Aomori Prefecture Route 29 (Hachinohe Belt Highway) – Hachinohe Station, Hashikami, Kuji, Hachinohe Expressway, Hachinohe-Kuji Expressway | |
| Aomori | Hachinohe | 244.4 | 151.9 | National Route 340 south | Western end of southbound side of National Route 340 one-way pair |
| Aomori | Hachinohe | 244.5 | 151.9 | National Route 340 north Aomori Prefecture Route 251 west – to National Route 104 | Western end of northbound side of National Route 340 one-way pair |
| Aomori | Hachinohe | 246.2 | 153.0 | National Route 45 (Hachinohe Bypass) – Towada, Kuji Aomori Prefecture Route 1 east –Kabushima, Tanesashi Seaside | Northern terminus; eastern end of National Route 340 one-way pair; northbound traffic continues as Aomori Prefecture Route 1 east |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Closed/former Concurrency terminus ||||||