Table:
text: List of cities in Punjab, Pakistan by area
Punjab
Punjab
Serial_No_ District Headquartered_City City_Population_2009 City_Areakm_2_
28 Rahim Yar Khan District Rahim Yar Khan City 340810 22
29 Rajanpur District Rajanpur City 42986 06
30 Rawalpindi District Rawalpindi City 1933933 110
31 Sahiwal District Sahiwal City 247706 28
32 Sargodha District Sargodha City 586922 50
33 Sheikhupura District Sheikhupura City 411834 22
34 Sialkot District Sialkot City 502721 42
35 Toba Tek Singh District Toba Tek Singh City 74480 09
36 Vehari District Vehari City 124513 12

text: List of cities in Punjab, Pakistan by area
Punjab
Punjab
Serial_No_ District Headquartered_City City_Population_2009 City_Areakm_2_
01 Attock District Attock City 94620 20
02 Bahawalnagar District Bahawalnagar City 134936 13
03 Bahawalpur District Bahawalpur City 530438 38
04 Bhakkar District Bhakkar City 89380 15
05 Chakwal District Chakwal City 113524 10
06 Chiniot District Chiniot City 219254 12
07 Dera Ghazi Khan District Dera Ghazi Khan City 464742 22
08 Faisalabad District Faisalabad City 2793721 147
09 Gujranwala District Gujranwala City 1526168 75
10 Gujrat District Gujrat City 328512 25
11 Hafizabad District Hafizabad City 165936 10
12 Jhang District Jhang City 365198 28
13 Jhelum District Jhelum City 172073 22

text: List of cities in Punjab, Pakistan by area
Punjab
Punjab
Serial_No_ District Headquartered_City City_Population_2009 City_Areakm_2_
14 Kasur District Kasur City 314617 18
15 Khanewal District Khanewal City 165038 17
16 Khushab District Jauharabad City 38475 12
17 Lahore District Lahore City 6936563 462
18 Layyah District Layyah City 82734 10
19 Lodhran District Lodhran City 93232 08
20 Mandi Bahauddin District Mandi Bahauddin City 150980 09
21 Mianwali District Mianwali City 93659 20
22 Multan District Multan City 1566932 133
23 Muzaffargarh District Muzaffargarh City 158597 15
24 Nankana Sahib District Nankana Sahib City 60137 06
25 Narowal District Narowal City 74417 07
26 Okara District Okara City 232386 21
27 Pakpattan District Pakpattan City 136510 14

Question: From list of cities in Punjab Pakistan by area, what was the lowest city population for district of Rajanpur with an area of 6 sq km and a serial number less than 29?