Jining High-tech Zone is at the county level and is at the same level as Jining Central District, Rencheng District and the counties and cities below. The area code of Qufu belongs to Jining and does not have an independent area code, which is 0537.
By the way, one more thing, the High-tech Zone is not only at the county level, but the salary for working there is much higher than other places, it should be the highest.