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  Population Census

I Daytime Population

Ratio of the day to night population is high in Tokyo-to and Osaka-fu, and low in their neighboring prefectures.

- A breakdown, by prefecture, of the daytime population in 2000 shows the highest number in Tokyo-to at 14.67 million (11.6 percent of the national population), followed by Osaka-fu at 9.31 million (7.3 percent), Kanagawa-ken at 7.63 million (6.0 percent), Aichi-ken at 7.13 million (5.6 percent) and Saitama-ken at 5.99 million (4.7 percent). The rankings for daytime population in these top five prefectures is the same as that for the size of the resident population.
With regard to the ratio of the day to night population (ratio of the daytime population per 100 daytime resident population), Tokyo-to had the nation's highest at 122.0, followed by Osaka-fu at 105.9, with 17 prefectures exceeding 100. In contrast, three prefectures adjacent to Tokyo-to and Osaka-fu showed a ratio of 90 for the day to night population. These were Saitama-ken (86.4), Chiba-ken (87.6) and Nara-ken (87.6).
A comparison of the ratio of the day to night population with 1995 shows a trend toward a decline in the ratio in prefectures exceeding 100 such as Tokyo-to and Osaka-fu, and a trend toward an increase in prefectures such as Saitama and Chiba where the ratio is lower than 100.
(Table 1-1, Figure 1-1)

Figure 1-1.  Ratio of Daytime Population to Nighttime Population - Prefectures (2000)

Table 1-1.  Trend of Daytime Population, Nighttime Population and Ratio of Daytime Population to Nighttime Population - Prefectures (1990 - 2000) 

  The daytime population in Osaka-shi declined by approximately 140,000 persons.

- A breakdown of the daytime population in prefectural seats and 13 major cities shows that the Ku-area of Tokyo had a daytime population of 11.13 million; Osaka-shi 3.66 million; Yokohama-shi 3.09 million, and Nagoya-shi 2.51 million. Declines in the daytime population were observed in 18 cities including the Ku-area of Tokyo, Nagoya-shi and Osaka-shi, with Osaka-shi in particular falling by approximately 140,000 from 1995. On the other hand, the daytime population grew in 31 cities, with Yokohama-shi in particular increasing by around 130,000 from 1995.

The ratio of the day to night population exceeded 100 in 43 cities including Osaka-shi at 141.2 and the Ku-area of Tokyo at 137.5, while it dropped below 100 in six cities, of which two, Urawa-shi (85.8) and Kawasaki-shi (87.8) were below 90. (Table 1-2)

Table 1-2.  Daytime Population, Nighttime Population and Ratio of Daytime Population to Nighttime Population - Prefectural Seats and 13 Major Cities (1995, 2000)

The daytime population declined in wards such as Chiyoda-ku and Chuo-ku, Tokyo.

- A breakdown of the daytime population in the Ku-area of Tokyo showed Chiyoda-ku to have the largest daytime population at 860,000 persons (23.7 times the resident population), followed by Minato-ku at 840,000 and Shinjuku-ku at 800,000. Daytime population is declining sharply in the central districts of Tokyo-to such as Chiyoda-ku and Chuo-ku, and with the addition of wards such as Taito-ku, Toshima-ku and Sumida-ku, a total of 11 wards showed a decrease.
In the ratio of the day to night population, Chiyoda-ku was the highest at 2374.4, followed by six other wards of over 200 including Chuo-ku at 897.6, and Minato-ku at 525.7. On the other hand, the lowest ratio was observed in Nerima-ku at 77.5, and with additional wards such as Edogawa-ku at 81.2 and Katsushika-ku at 81.9, a total of ten wards showed a ratio below 100. A sharp drop in the ratio of the day to night population in Chiyoda-ku from 2732.9 in 1995 has caused a substantial decline in the ratio of the day to night population in central Tokyo. On the other hand, in ten wards such as Shinagawa-ku and Nakano-ku, the ratio of the day to night population has risen. (Table 1-3, Figure 1-2, Figure 1-3)

Figure 1-2.  Ratio of Daytime Population to Nighttime Population in the Ku-Area of Tokyo (2000)

Figure 1-3.  Daytime Population and Nighttime Population in the Ku-Area of Tokyo (2000)

Table 1-3.  Daytime Population, Nighttime Population and Ratio of Daytime Population to Nighttime Population in the Ku-Area of Tokyo (1995, 2000)  

The daytime population in Chuo-ku, Osaka-shi is 9.5 times the resident population.

- The daytime population in Osaka-shi has grown, as seen in wards such as Chuo-ku at 520,000 persons (9.5 times the resident population) and Kita-ku at 430,000. The ratio of the day to night population exceeded 100 in 15 wards including four wards where the ratio was over 200, as observed in Chuo-ku at 947.3 and Kita-ku at 473.5. Concentrated in the eastern and southern parts of the city, nine wards were below 100, as observed in wards like Higashi-Sumiyoshi-ku at 87.5, Sumiyoshi-ku at 88.7 and Tsurumi-ku at 89.5. (Table 1-4, Figure 1-4, Figure 1-5)

Figure 1-4.  Ratio of Daytime Population to Nighttime Population in Osaka-shi (2000)

Figure 1-5.  Daytime Population and Nighttime Population in Osaka-shi (2000)

Table 1-4.  Daytime Population, Nighttime Population and Ratio of Daytime Population to Nighttime Population in Osaka-shi (1995, 2000)

The daytime population of Naka-ku, Nagoya-shi is 5.6 times the resident population.

- The daytime population of Nagoya-shi has grown, as seen in wards such as Naka-ku at 330,000 persons (5.6 times the resident population) and Nakamura-ku at 240,000. The ratio of the day to night population exceeds 100 in nine wards including Naka-ku at 557.5. Concentrated in the eastern and southern parts of the city, seven wards were below 100, as observed in Midori-ku at 75.4, Moriyama-ku at 82.5 and Meito-ku at 83.1.

(Table 1-5, Figure 1-6, Figure 1-7)

Figure 1-6.  Ratio of Daytime Population to Nighttime Population in Nagoya-shi (2000)

Figure 1-7.  Daytime Population and Nighttime Population in Nagoya-shi (2000)

Table 1-5.  Daytime Population, Nighttime Population and Ratio of Daytime Population to Nighttime Population in Nagoya-shi (1995, 2000)

The daytime population declined in municipal wards with a high ratio of day to night population.

- A breakdown by municipality of the ratio of the day to night population showed that most of the 30 top-ranking municipalities were the wards of the 13 metropolitan cities, and outside these wards, Kumiyama-cho of Kyoto-fu was the highest-ranked in terms of ratio (171.5), in 24th place. As shown by the fact that the daytime population has declined in nine wards out of the top ten wards in terms of the ratio of the day to night population, the daytime population is declining in municipal wards where the ratio of the day to night population is high.
Many of the municipalities with a low ratio of day to night population are located in such residential areas in the suburbs of cities as Kiyone-mura in Okayama-ken (60.3), Tone-machi in Ibaraki-ken (60.9), Toyono-cho in Osaka-fu (63.5), Kamo-cho in Kyoto-fu (63.9), and Heguri-cho in Nara-ken (64.9).

(Table 1-6)

Table 1-6.  Ranking of Ratio of Daytime Population to Nighttime Population - Municipalities with Nighttime Population of 5,000 or More (2000)

 II Inflow Population of the Three Major Cities

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