As of January 1, 2024, the population of the region was 829,984 people, or 4.1% of the national figure (RK – 20.0 million people). Compared to last year, the number decreased by 2,250 people or 0.3% (over the past decade, the decrease amounted to 51.0 thousand people or 5.8%).
The urban population prevails in the region – 62.4% (517,698 people).
The largest number in the regional center is 268,164 people (32.3%), the smallest is in the Naurzum district 8,877 people (1.1%).
More than 100 nationalities and nationalities live in the region. The main share of the population is Kazakhs – 44.6%, Russians – 33.5%, Ukrainians – 10.3%, Germans – 3.7%, Belarusians – 1.9%, Tatars – 1.7%, other nationalities – 4.3%.
The population density is 4.2 people per square kilometer. The cities of Kostanay, Rudny and Lisakovsk are the most densely populated, the least are the southern regions of the region, whose density ranges from 0.3 to 2.5 people per square kilometer.