Arki is a town, tehsil and Nagar panchayat in Solan district of Himachal Pradesh, India. The town is famous for its fort built in the late
18th century when Arki was the capital of the erstwhile hill state of Baghal. The Postal Code of Arki is 173208.
Solan District came into existence at the time of the reorganisation of the districts of the State on Ist September, 1972. The District was carved out of Solan and Arki tehsils of the then Mahasu district and tehsils of Kandaghat and Nalagarh of the then Shimla District. Administratively, the district is divided into four Sub-division viz. Solan comprising of Solan and Kasauli tehsils, Nalagarh covers the juridisdiction of Arki and Kandaghat Sub-divisions covers their respective tehsils. The total geographical area of the district according to the Surveyour General of India is 1,936 sq. km. which constitutes 3.49 percent of the total area of the State and ranks 9th amongst the district.
The District is bounded by Shimla district in the North and by Ropar District of Punjab and Ambala district of Harayana in the south, by Sirmaur District in the east and by Bilaspur district in the west. Mandi District touches the boundary of Solan district in norht-east. The shape of the district is rectangualar with slight bulge on the northern side intruding towards Mandi district.It is located between the longitudes 76.42 and 77.20 degree and latitudes 30.05 and 31.15 degree north.