The municipality of Sjogi is constituted by the cities of Strendur, Innan Glyvur, Kolbeinargjogv, Morskranes and Selatrad, and has 1002 inhabitants, 789 of which live in Strendur. The local school is attended by 238 students. 

Six big fishing boats and various cutters are docked at Strendur and show how the main industry is that of fishing. The processing of salmon, the production of fries and finally pisciculture follow this primary activity. There are also companies producing stone products, an IT company and a wool factory. There are also two big AZIENDE AGRICOLE.

Strendur, the main city of the municipality, has a church, a missionary house, a city hall, a bank, a savings bank and a post office. There are also a surgery and an insurance company.

The city of Selatrad hosts the Scout Centre of the Faeroe Islands, a sports club and an aviation club. The elderly gather mostly in an active association for the retired.

The first mail deposit was established in Strendur on 1 June, 1903, but was closed five years later in 1908. The first manager for the collecting of mail was Joen Poulsen. Poulsen was a teacher and came from Svinaum and was politically active for many years.

Between 1908 and 1918, an office for mail exchange was activated in Strendur, in a stock room located beside the "Heygsstod” embankment. The owner of the stock room was Hans Jacob Poulsen.

The mail deposit reopened on 1 October 1918 and Hans Jacob Johansen became the new manager for the collecting of mail, which, at that time, did not require a full-time occupation. In fact, Hans Jacob Johansen was also a trader, fishing chief, a farmer and also a commissioner for the transports via sea for the Thorsvan Company for “Maelkeforsyning og Margarinefabrik” (milk supplies margarine production). Hans Jacob Johnasen would therefore send and receive all the cargos from and to Strendur and the nearby villages. The entire production of milk of the region passed through his hands before arriving at Tartan dairy.

Together with the reopening of the mail deposit in 1918, another deposit was opened in the nearby village of Selatrad, and worked also for the city of Morskranes.

The mail deposit of Strendur, after the fire of 1932 destroying almost the entire departing mail for 846,05 DKK, was transferred in another building still owned by Hans Jacob Johansen. This building is today the Main Office of Strendur dock.

The stock room and the house, then used as a fish deposit, were located one next to the other.

When Martin Johansen took the position of manager for the collecting of mail, on 1 July 1967, the office was again established in the house where it had been between 1918 and 1932, and there it remained until it was transferred downtown in a bank building owned by Feroya Banki, on 1 November 1981.

Martin Johansen retired on 30 September 1997 and was substituted by the current manager, Joan Sandursdottir.

Today, all of the five cities of the municipality depend from the same post office and from Strendur distribution. The cities of Morskenen and Selatrad, whose mail deposit has been closed in 1991, subscribed a settlement for the delivery of mail in the rural areas.