Olcnava Detrefalva
Municipality
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Olcnava Location of Olcnava in the Košice Region Show map of Košice Region Olcnava Location of Olcnava in Slovakia Show map of Slovakia
Coordinates: 48°56′N 20°45′E / 48.93°N 20.75°E / 48.93; 20.75
Country	Slovakia
Region	Košice Region
District	Spišská Nová Ves District
First mentioned	1312
Area [1]
• Total	15.21 km2 (5.87 sq mi)
Elevation [3]	411 m (1,348 ft)
Population  (2024)[2]
• Total	1,015
Time zone	UTC+1 (CET)
• Summer (DST)	UTC+2 (CEST)
Postal code	536 1[3]
Area code	+421 53[3]
Vehicle registration plate (until 2022)	SN
Website	olcnava.sk

Olcnava (Hungarian: Detrefalva) is a village and municipality in the Spišská Nová Ves District in the Košice Region of central-eastern Slovakia.^[4]

In historical records the village was first mentioned in 1312.

The municipality lies at an altitude of 411 metres (1,348 ft)^[3] and covers an area of 15.21 km² (5.87 sq mi) (2024).^[5]

It has a population of 1015 people (31 December 2024).^[7]

In year 2021 was 1040 people by ethnicity 971 as Slovak, 68 as Not found out, 18 as Romani, 10 as Rusyn, 4 as Other, 2 as Czech, 2 as Polish, 2 as English, 1 as Ukrainian, 1 as Serbian, 1 as German and 1 as Hungarian.

Note on population: The difference between the population numbers above and in the census (here and below) is that the population numbers above are mostly made up of permanent residents, etc.; and the census should indicate the place where people actually mainly live.
For example, a student is a citizen of a village because they have permanent residence there (they lived there as a child and has parents), but most of the time he studies at a university in the city.

In year 2021 was 1040 people by religion 820 from Roman Catholic Church, 92 from Not found out, 84 from None, 17 from Greek Catholic Church, 12 from Evangelical Church, 4 from Ad hoc movements, 3 from Calvinist Church, 3 from Eastern Orthodox Church, 3 from Jehovah's Witnesses, 1 from Other and 1 from Baptists Church.