The territory of the diocese of Ostuni was added to it in 1821.

On 14 February 2008, the territory of the diocese was reorganized.

The present territory of the diocese coincide with the Province of Liège.

In local government terms, the territory of the diocese covers the unitary authority areas of:

The territory of the diocese includes two civil districts Ramanathapuram and Sivagangai.

The territory of the old diocese now belongs to the archdiocese of Toulouse.

About 10,000 of the 85,000 people in the territory of the diocese (approximately 12% of the total population) are Catholic, according to the Church's estimation.

The restricted territory of the diocese meant that it needed only one archdeacon to supervise all 97 parishes.

This role involved the assumption of quasi-regal power and authority within the territory of the diocese.

The territory of the diocese covers the Province of Limburg.