Which preposition to use with prefectures

of Occurrences 51%

[Footnote 8: T'un-hwang is still the name of one of the two districts constituting the department of Gan-se, the most western of the prefectures of Kan-suh; beyond the termination of the Great Wall.]

at Occurrences 4%

The President, Marshal MacMahon, was living at the Prefecture at Versailles and received every Thursday evening.

in Occurrences 4%

Prince Scharmberg-Lippe, whom we had passed driving away from the Prefecture in his automobile as we drove to it in ours, was the last of four brothers.

as Occurrences 1%

We had made this journey and now the hour was seven in the evening, and we were dining in the big hall of the Prefecture as the guests of His Excellency, Field Marshal von Heeringen, commanding the Seventh Army of the German Kaiserdining, I might add, from fine French plates, with smart German orderlies for waiters.

through Occurrences 1%

The commerce brought profit not only to the caravan traders, most of whom were probably foreigners, but to the officials in the provinces and prefectures through which the routes passed.

Which preposition to use with  prefectures