English learners (ELs) are students whose primary language is not English and are eligible for English language development services through the Transitional Bilingual Instruction Program (TBIP). Washington state's TBIP has existed since the passage of Senate Bill 2149 in 1979, and is codified in the Revised Code of Washington (RCW) Chapter 28A.180. The Transitional Bilingual Instruction Act recognized that classes taught only in English are inadequate to meet the needs of ELs. Through TBIP legislation, all eligible English learners in Washington shall receive bilingual instruction, or an approved alternative program of English language development instruction, until the student is proficient in English. During the 2019-20 school year, 139,238 students were identified as ELs, a 3% increase from 2018-19. Enrollment was highest in urban areas in the western part of the state and in the Yakima Valley. Students served by TBIP in 2019-20 spoke 231 different home languages. The most identified language was Spanish, spoken by 55% of students. While Spanish continues to be the top language other than English, districts continue to serve students who speak a diverse range of languages. The next 10 most common languages were Russian, Vietnamese, Ukrainian, Somali, Arabic, Marshallese, Chinese Mandarin, Korean, Punjabi, and Tagalog. Total expenditures to support English language development services across the state was $239.9 million, of which $227.7 million was from TBIP funding. This was a 7.1% increase in the TBIP total expenditures from the previous year. [For the 2020 report, see ED616409.]