By case-studying a multi-route school-choice system like that of Hong Kong, this study attempts to investigate the role of district characteristics in student access to school choice under different admissions policies. A district's income, education, and immigrant level all had stronger negative impacts on school-choice assignments made by the Boston mechanism than by the student proposing deferred acceptance algorithm. Giving guaranteed or priority admissions to legacy students was found to be an admissions policy that may enhance students' admittance to the school of their choice when school districts got poorer, less-educated, or less immigrant-concentrated.