Miercurea Ciuc
Miercurea Ciuc 
    Csíkszereda  | |
|---|---|
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Location in Harghita County  | |
| Coordinates: 46°21′34″N 25°48′6″E / 46.35944°N 25.80167°E | |
| Country | Romania | 
| County | Harghita | 
| Government | |
| • Mayor (2020–2024) | Attila Korodi (UDMR) | 
Area  | 117.66 km2 (45.43 sq mi) | 
| Elevation | 662 m (2,172 ft) | 
| Highest elevation | 730 m (2,400 ft) | 
| Lowest elevation | 655 m (2,149 ft) | 
| Population  (2021-12-01)  | 34,484 | 
| • Density | 290/km2 (760/sq mi) | 
| Time zone | EET/EEST (UTC+2/+3) | 
| Postal code | 530100–530242  | 
| Area code | (+40) 0266 | 
| Vehicle reg. | HR | 
| Website | www | 
Miercurea Ciuc (Romanian: [ˈmjerkure̯a ˈtʃjuk] ⓘ; Hungarian: Csíkszereda [ˈt͡ʃiːksɛrɛdɒ] ⓘ; German: Szeklerburg) is the county seat of Harghita County, Romania. It lies in the Székely Land, a mainly Hungarian-speaking ethno-cultural region in eastern Transylvania, and is situated in the Olt River valley.
The city administers three villages: Ciba (Csiba), Harghita-Băi (Hargita-fürdő), and Jigodin-Băi (Zsögöd-fürdő), including Jigodin (Csíkzsögöd).