What makes houses and streets belong to towns in Finland?

[Pikari]

@alv

Generally, we write addresses as
( where available) (newline)

( not really used, but last, if written)

(And, in fact, above can be “postal area name”, often a former municipality or just a smaller part of one. But even the current municipality is used in real life.)

In some cases an address might carry an “extra” letter, such as Mannerheimintie 4a B 10 vs .Mannerheimintie 4b B 10. The house number 4a resp. 4b distinguishes two separate neighbouring houses.

Sometimes, when a house of flats does have just one entrance, the adress might look like Mannerheimintie 5 as. 10. In this case as. is short for asunto (flat) and means house number 5, flat 10.

The addresses of terraced houses or dual family houses might look like Mannerheimintie 6A, Mannerheimintie 6B, Mannerheimintie 6C - where A, B resp. C stands for an appartment entrance.

@Zkir

Well, another question, not related directly to postal addresses. How should I assign speedlimit for roads in Finland?

In Russia we distinguish between streets (inside cities/villages) and roads (outside cities/villages), from the point of view of the traffic regulation.

For the streets speed limit is 60 kmph, and for roads speed limit is 90 kmph. For conversion purposes, I check if a highway is inside place polygon.

In Finland the concerning limits are usually 50 km/h resp. 80 km/h. Trunk/primary and sometimes even secondary roads 100 km/h and motorways 120 km/h. But in populated areas the speed limit might drop down to 30 or 40 km/h (on residential streets). And roads with an 80-limit might in wintertime get a speed limit of 70 km/h, as well as motorways down from 120 to 100 km/h.