Translation

人口の多い / 人口密度の高い / 人が多く住む

Meaning

Populous describes a place that has many inhabitants or a high population. It is for cities, countries, regions, and areas, not for things people like. Do not confuse it with popular, which means liked by many people.

Examples

• 東京は世界でも特に人口の多い都市の一つです。
  Tokyo is one of the world's most populous cities.
• その人口の多い地域では住宅費が上がっています。
  Housing costs are rising in the populous region.