Zagorje ob Savi was attested in written sources as Zagorie in 1296, Zagoͤr in 1311, Sager in 1362, Sagor in 1391, and Seger in 1419, among other spellings.[6][7] The name of the settlement was changed from Zagorje to Zagorje ob Savi in 1955.[8] In the early 20th century the German name was Sagor.[2]
Historical population
Year
Pop.
±%
1948
4,318
—
1953
4,824
+11.7%
1961
6,010
+24.6%
1971
6,738
+12.1%
1981
7,491
+11.2%
1991
7,445
−0.6%
2002
6,893
−7.4%
2011
6,493
−5.8%
2021
6,020
−7.3%
Population size may be affected by changes in administrative divisions.
History
Archaeological evidence shows that the area was already settled in the Late Bronze Age and Iron Age.[9] In 1755 deposits of coal were discovered in the area and the town's economic development began. Coal mining was one of the area's main activities until 1995, when the last mines were closed.[4] In 2010, Zagorje ob Savi was heavily affected by floods.