The Uijeongbu diocesan territory covers 2,564 square kilometers and includes Uijeongbu, Goyang, Guri, Namyangju, Paju, Dongducheon, Yangju cities and Yeoncheon-gun county in Gyeonggi-do province.
Uijeongbu diocese was carved out of Seoul archdiocese on June 24, 2004. It belongs to the Ecclesiastical Province of Seoul.
With the erection of the diocese, Bishop Lee hoped the new diocese would show Jesus' love for people through active, positive ministries for the needy. And he also hoped the diocese play a great role in peaceful reunification of the two Koreas, as his diocese borders the communist North Korea.
Every year Uijeongbu diocese holds a special mass to pray for families separated as a result of the North-South division of the Korean peninsula at Imjingak.
Noting that the diocese borders the Demilitarized Zone (DMZ), Bishop Lee said, "We are deeply interested in the national reunification and families divided by the national division. It's our duty to serve them."
Since November 2005, Uijeongbu diocese has produced audio and Braille versions of its weekly diocesan bulletin for blind Catholics.
In Uijeongbu diocesan jurisdiction, the population is 3,114,536 at the end of 2017. (Some 5.2 percent of the whole population 51 million in the country) Most residents are ethnic Koreans.
The standard Korean is in use. English, a mandatory subject in schools, can be spoken and understood in tourist areas. All the traffic signs are expressed in English and Korean.
Uijeongbu diocese falls within the temperate Zone and has the four distinctive seasons of spring, summer, autumn and winter. The yearly average temperature of Uijeongbu is 12 degrees Celsius.
The annual precipitation in the region averages 1,100 millimeters. Most of the rainfall is concentrated in the rainy months (monsoon period) of June through September.
Uijeongbu is located at the middle-western Korean peninsula or north of Seoul. Most of the diocese is northern part of Gyeonggi-do province which is relatively undeveloped area.
Recently the DMZ attracts attention as ecological preservation and peaceful interchange area between North and South Koreas.