Law on the Election of Local Government Councils § Section 2

(1) The number of councillors to be elected
to the municipality council shall be determined in accordance
with the number of inhabitants registered in the Register of
Natural Persons in the administrative territory of the relevant
local government on the day when the elections are announced:
up to 30 000 inhabitants - 15 councillors;
from 30 001 to 60 000 inhabitants - 19 councillors;
more than 60 000 inhabitants - 23 councillors.
(2) The number of councillors to be elected to the city
council, except for Rīga City Council, shall be determined in
accordance with the number of inhabitants registered in the
Register of Natural Persons in the administrative territory of
the relevant local government on the day when the elections are
announced:
up to 50 000 inhabitants - 13 councillors;
more than 50 000 inhabitants - 15 councillors.
(3) There are 60 councillors in the composition of the Rīga
City Council.
[2 October 2008; 14 February 2013; 17 June 2020; 17
December 2020 / Amendment regarding the replacement of the
words "Population Register" with the words "Register of Natural
Persons" shall come into force on 28 June 2021. See Paragraph 17
of Transitional Provisions]