The immutable, decentralized, smart contract-enabled, time-stamped, shareable, and append-only characteristics of blockchain technology have made it a subject of interest in almost every industry. The government sector is also exploring its potential uses to foster transparency, trust, and accountability. However, conducting a population census that is completely trustworthy, transparent, and accountable is a challenge, and blockchain technology could be used to address some of these issues. The current census system has shortcomings, such as incomplete population coverage and racial or ethnic discrimination. Our proposal involves the use of blockchain technology to create a solution for conducting a national population census in Pakistan, which would help alleviate these issues. In this paper, we investigate the architecture design and system capacity required for this blockchain-based solution. Our insights and findings will help advance the field of blockchain and promote the development of new and innovative solutions for census.