Most populated postal codes

The 20 postal code areas in Lahti with the most residents, and the 20 with the fewest, out of 93 with a published figure.

	Area	Municipality	Postal code	Residents
1	Lahti	Lahti	15140	15,412
2	Orimattila	Lahti	16300	10,256
3	Lahti	Lahti	15240	7,831
4	Lahti	Lahti	15700	7,497
5	Lahti	Lahti	15100	6,937
6	Heinola	Lahti	18100	6,595
7	Lahti	Lahti	15110	5,763
8	Lahti	Lahti	15610	5,317
9	Vääksy	Lahti	17200	5,122
10	Lahti	Lahti	15500	4,883
11	Lahti	Lahti	15150	4,479
12	Villähde	Lahti	15540	4,418
13	Lahti	Lahti	15210	4,382
14	Hollola	Lahti	15880	4,350
15	Hollola	Lahti	15870	4,054
16	Lahti	Lahti	15300	3,887
17	Nastola	Lahti	15560	3,777
18	Lahti	Lahti	15950	3,708
19	Hollola	Lahti	15860	3,638
20	Lahti	Lahti	15170	3,636

Least populated postal codes

	Area	Municipality	Postal code	Residents
1	Okkeri	Lahti	16160	102
2	Liikola	Lahti	19740	104
3	Vesijako	Lahti	17630	104
4	Valittula	Lahti	19770	107
5	Villikkala	Lahti	16270	121
6	Vierumäki	Lahti	19120	134
7	Pohela	Lahti	19620	143
8	Pietilä	Lahti	17220	153
9	Hietana	Lahti	16260	157
10	Viitaila	Lahti	17410	188
11	Arrakoski	Lahti	17530	194
12	Iso-Äiniö	Lahti	17450	202
13	Ruuhijärvi	Lahti	15580	211
14	Nyystölä	Lahti	17510	223
15	Koitti	Lahti	19540	242
16	Mertie	Lahti	16540	245
17	Maakeski	Lahti	17470	256
18	Pakaa	Lahti	16390	257
19	Kurhila	Lahti	17430	260
20	Auttoinen	Lahti	17610	264

Most populated postal codes — All of Finland

Places with fewer than 100 residents are excluded: a figure drawn from a handful of people carries more uncertainty than the differences being ranked.