Here is a list of 20 popular suburbs in Nairobi, Kenya, along with some reasons why they are popular:

1. Kileleshwa: Kileleshwa is a popular and upscale neighborhood in Nairobi, known for its tree-lined streets, large properties, and close proximity to the city center.

2. Kilimani: Kilimani is a popular neighborhood in Nairobi due to its central location and wide range of amenities, including shopping centers, restaurants, and parks.

3. Lavington: Lavington is a upscale neighborhood in Nairobi that is popular among expatriates and wealthy Kenyans. It is known for its large homes, gated communities, and green spaces.

4. Runda: Runda is a popular and exclusive neighborhood in Nairobi, known for its large plots of land and beautiful homes.

5. Westlands: Westlands is a popular neighborhood in Nairobi, known for its shopping centers, nightlife, and proximity to the city center.

6. Ngong Road: Ngong Road is a popular neighborhood in Nairobi due to its central location and wide range of amenities.

7. Parklands: Parklands is a popular neighborhood in Nairobi, known for its parks and green spaces.

8. Hurlingham: Hurlingham is a popular neighborhood in Nairobi, known for its upscale properties and proximity to the city center.

9. Kilimani: Kilimani is a popular neighborhood in Nairobi, known for its central location and wide range of amenities.

10. Karen: Karen is a popular neighborhood in Nairobi, known for its upscale properties and close proximity to Nairobi National Park.

11. Kiambu Road: Kiambu Road is a popular neighborhood in Nairobi, known for its central location and wide range of amenities.

12. Embakasi: Embakasi is a popular neighborhood in Nairobi, known for its affordable properties and close proximity to Jomo Kenyatta International Airport.

13. Syokimau: Syokimau is a popular neighborhood in Nairobi, known for its affordable properties and close proximity to Jomo Kenyatta International Airport.

14. Kitengela: Kitengela is a popular neighborhood in Nairobi, known for its affordable properties and close proximity to Nairobi National Park.

15. Thika Road: Thika Road is a popular neighborhood in Nairobi, known for its central location and wide range of amenities.

16. Langata: Langata is a popular neighborhood in Nairobi, known for its close proximity to Nairobi National Park and Jomo Kenyatta International Airport.

17. South B: South B is a popular neighborhood in Nairobi, known for its affordable properties and wide range of amenities.

18. Lower Kabete: Lower Kabete is a popular neighborhood in Nairobi, known for its large properties and close proximity to the city center.

19. Upper Hill: Upper Hill is a popular neighborhood in Nairobi, known for its upscale properties and close proximity to the city center.

20. South C: South C is a popular neighborhood in Nairobi, known for its affordable properties and close proximity to Jomo Kenyatta International Airport.

These neighborhoods are considered popular for various reasons, including proximity to amenities, location, the type of properties available, and the demographic of residents in the area.