Yamakoshi, Niigata

{{Infobox settlement

| name = Yamakoshi

| official_name =

| native_name = {{nobold|山古志村}}

| native_name_lang = ja

| settlement_type = Former municipality

| other_name =

| image_skyline = Rice terraces, Yamakoshi, Niigata.jpg

| image_caption = Rice terraces in Yamakoshi

| image_flag = Flag of Yamakoshi, Niigata (1981–2005).svg

| image_seal = Emblem of Yamakoshi, Niigata (1981–2005).svg

| map_caption = Location of Yamakoshi in Niigata Prefecture

| pushpin_map =

| pushpin_map_caption = Location in Japan

| subdivision_type = Country

| subdivision_name = Japan

| subdivision_type1 = Region

| subdivision_name1 = Hokuriku

| subdivision_type2 = Prefecture

| subdivision_name2 = Niigata Prefecture

| subdivision_type3 = District

| subdivision_name3 =

| extinct_title = Merged

| extinct_date = April 1, 2005
(now part of Nagaoka)

| leader_title = Mayor

| leader_name =

| leader_title1 = Vice Mayor

| leader_name1 =

| unit_pref = Metric

| area_total_km2 = 39.83

| population_total = 2,035

| population_as_of = 2003

| timezone1 = JST

| utc_offset1 = +09:00

| postal_code_type =

| postal_code =

| blank_name_sec1 = City hall address

| blank_info_sec1 =

}}

File:Amalgamation_Nagaoka_jp.svg]]

{{nihongo|Yamakoshi|山古志村|Yamakoshi-mura}} was a village located in Koshi District, Niigata Prefecture, Japan.

As of 2003, the village had an estimated population of 2,035 and a density of 51.09 persons per km². The total area was 39.83 km².

On April 1, 2005, Yamakoshi, along with the town of Oguni (from Kariwa District), the town of Nakanoshima (from Minamikanbara District), and the towns of Koshiji and Mishima (both from Santō District), was merged into the expanded city of Nagaoka.{{Cite book |url=https://books.google.com/books?id=jK33qQjYcQ4C |title=住民基本台帳人口移動報告年報 |date=2005 |publisher=総務庁統計局 |pages=139 |language=ja |trans-title=Annual Report on Population Movement in the Basic Resident Register |quote=Nakanoshima-machi, Koshiji-machi, Mishima-machi, Yamakoshi-mura and Oguni-machi were incorporated into Nagaoka-shi as of April 1, 2005.}}{{Cite web |title=越路町と長岡市との合併 {{!}} 長岡市よくある質問（Q＆A） |url=https://qa.city.nagaoka.niigata.jp/faq/show/293?category_id=142&return_path=/category/show/142?page=1&site_domain=default&site_domain=default&sort=sort_access&sort_order=desc&site_domain=default |access-date=2024-02-04 |website=長岡市 |quote=平成17年4月1日に南蒲原郡中之島町、三島郡三島町、古志郡山古志村、刈羽郡小国町と一緒に長岡市に編入合併しました。}}

On October 23, 2004, Yamakoshi was hit by the 2004 Chūetsu earthquake.