The control and tracking of unauthorized immigrants into the country poses a major challenge to immigration authorities around the world. The Aliens control department of the Nigeria Immigration Service is concerned with the task of registering, monitoring and controlling the admission of aliens/immigrants into and out of Nigeria. Presently this task is manually done by the department designate. The aim of this study is to design and implement a computerized Aliens Control and Information Tracking System. The Object Oriented Analysis and Design Methodology (OOADM) were used to analyze our findings as well as developing the metamodel and information system. The system was designed and implemented as an online web based application capable of being accessed via the internet through the World Wide Web. The use of this replacement to the manual system will help to facilitate the handling of immigrant data storage and processing, tracking of illegal immigrants and also notify the immigration officers on immigrants with expired papers. Immigrant records can be found easily and quickly with no limit to the size of the records that can be stored.