Agriculture and animal husbandry are the most important sources of income for Kirklareli's residents. However, income from agriculture and animal husbandry is gradually decreasing each year; the amount of land available to farmers is decreasing, and a large portion of villagers are unable to make a living on their small plots, becoming detached from the land.

The introduction of high-value-added agricultural products to Kirklareli could offer a way out for those working in agriculture. Other notable features of the province include its areas suitable for organic farming, its extensive forest habitat, and its suitability for forest product production. A significant characteristic a visitor to Kirklareli's city center and districts will notice is its tranquility. For someone accustomed to daily life amidst the hustle and bustle of Istanbul, this silence can even be disturbing. The district of Vize, eager to capitalize on this characteristic, applied for "Cittaslow" (Slow City) and was accepted.

Kirklareli's demographics reflect those typical of Thrace. It is a province where immigrants constitute the majority and a large Romani population resides. The warmth, love of fun, and the Thracian charm, evident in Thrace, with their sentences ending in "be ya" without spelling out the "h" at the beginning of words, can also be seen in Kirklareli.

Kirklareli is a province with many ancient settlements notable for its prehistoric location. The first material documents relating to human existence in and around Kirklareli, understood to have been submerged for an extended period at the end of the Ice Age, reveal characteristics of the Neolithic period. Thrace, which later took its name from the first known settled tribes, maintained its partial or complete independence as small kingdoms or principalities, including Kirklareli, until the mid-Roman period.

Kirklareli, which suffered numerous invasions during the Roman and Byzantine periods due to its role as a transitional region, first fell to the Ottomans in 1363, during the reign of Murad I. From this date on, Kirklareli experienced a long period of peace and was subjected to great torment and hardship during the Balkan Wars and World War I, before gaining its final freedom on November 10, 1922. Our province, located on the Istranca (Yildiz) Mountains and the Ergene Plain sections of the Marmara Region, is bordered by Bulgaria to the north, the Black Sea to the northeast, Istanbul to the southeast, Tekirdağ to the south and Edirne to the west. Its surface area is 6,550 square kilometers. The province has a 180-kilometer land border with Bulgaria and a 60-kilometer sea coast with the Black Sea.

The province has an altitude of 203 meters above sea level, and the north and east are mountainous and forested, while the other parts are generally flat. A continental climate generally prevails in the region. Winters are harsh and rainy, and summers are hot and dry.

Its main rivers are the Ergene River and the Rezve Stream. The vegetation is forested and steppe.

The population density of Kirklareli is 50. Until 1965, the density in Kirklareli was above the national average. This is because of the migration the province received from the Balkan countries through population exchange and immigration. Between 1940 and 1945, Kirklareli's population decreased due to World War II, and between 1950 and 1955, the population started to increase again with immigrant families coming from abroad. The population density, which was high until 1960, began to decrease after 1965 with the start of migration out of the province.

After its conquest, Kirklareli was governed as a sanjak for many years. During the reign of Sultan Abdülmecit, it was made a district, and this status continued until the 1877-1878 Russo-Turkish War. After the evacuation of the Russians, Kirklareli became a governorship. Administratively, it was first attached to the Rumelia Province, with its capital in Manastir, then to the Silistre Province, and later became a Liva of the Edirne Province.

Kirklareli became a province in 1924. Today, Kirklareli has seven districts: Babaeski, Demirköy, Kofcaz, Luleburgaz, Pehlivankoy, Pinarhisar, and Vize.