To determine whether the land you have sold is covered within rural agricultural land or not, you need to be aware of below pointers specific to your case.
1. The population of the city should be taken as per last census i.e 2011 in this case.
2. If I assume that you have mentioned the correct population figures then the given land should be outside the municipal limit and more than 6km away from local limit of the municipality and not the office.
For detailed discussion and end to end solution on capital gains exemption, I would suggest you to take a telephonic consultation.