Per Japanese census data, the population of Chikuma has remained relatively constant for the past 40 years.
Climate
The city has a climate characterized by characterized by hot and humid summers, and relatively mild winters. The average annual temperature in Chikuma is 12.7 °C. The average annual rainfall is 1140 mm with September as the wettest month. The temperatures are highest on average in August, at around 26.2 °C, and lowest in January, at around 0 °C.
The area of present-day Chikuma was part of ancient Shinano Province and has been settled since prehistoric times. There are numerous burial tumuli in the city, including the Mori Shogunzukakofun, a mountaintop keyhole-shaped tomb dating from near the end of the Kofun period, which is one of the latest of its type in eastern Japan. During the Nara period, the area around the Shinano River was the settling for numerous poems in the Man'yōshū. The area was part of the holdings of Matsushiro Domain during the Edo period, and also prospered from a series of post stations on the pilgrimage route to the famed Zenkō-ji temple. The modern city of Chikuma was founded on September 1, 2003 by the merger of the former city of Koshoku, the town of Kamiyamada, and the town of Togura.
Chikuma is known for its production of knitted goods, food processing and light machinery manufacturing. Horticulture, especially that of apricots forms an important sector of the local economy.
is the largest of the three municipalities that were joined to form the current Chikuma city. Spanning the Chikuma River and bordering Nagano city to the south, it entends from the apricot fields of Anzu no Sato in the east to the highland area Hijiri Kogen in the west. Koshoku's history dates back to the Kofun Period, and several major archaeological sites remain. Later, in the Meiji Period, the inns located in Inariyama became a popular stopover for pilgrims en route to Zenkō-ji.
Former town of Kamiyamada
lies on the western bank of the Chikuma River, just north of the town of Sakaki. A popular hot spring village dating back to the 19th century, the town was one of many places of lodging on the pilgrimage route to Zenkō-ji.
Former town of Togura
lies on the east bank of the Chikuma River, across from Kamiyamada Onsen. With a history similar to that of Kamiyamada, it contains some hot spring bath facilities as well as the area's only railway station.