Three is the magic number for the Dublin City School District, at least as far as its high schools are concerned.

According to the results of a "build-out study" the district released Aug. 28, a fourth high school is not expected to be needed even when all land in the district has been developed. That "build-out" is expected to be complete in 2036.

The district has three high schools: Coffman, Jerome and Scioto.

The building that now is called Coffman was opened in 1973 as Dublin High School. It became Coffman when Scioto opened in 1995. Jerome opened in 2004.

Although the district's Emerald Campus, 5175 Emerald Parkway, opened in August, it's not actually a fourth high school.

The building which formerly housed Verizon Wireless offices is a facility where students coming from one of the three district high schools will attend classes for part of the day to take career-exploration and College Credit Plus courses.

Academies in the building include: Engineering, IT Cisco (in partnership with Tolles Career & Technical School), Young Professionals, the Dublin Teachers Academy, Dublin Business Academy and Biomedical Research.

The school district paid consulting firm Cooperative Strategies about $20,000 for the build-out study, district Treasurer Brian Kern said.

The school district is 41.2 square miles and 26,367 acres, said Scott Leopold, partner with Cooperative Strategies.

Land within the district is in Union, Delaware and Franklin counties; Jerome, Concord, Perry, Washington and Norwich townships; and the cities of Dublin, Shawnee Hills, Columbus and Upper Arlington. The majority of single-family growth is projected to occur in Jerome Township, Leopold said.

To determine district growth, Cooperative Strategies analyzes how many students are generated from homes based on the homes' age and price point, Leopold said.

A little less than 2,200 acres of land within the district are undeveloped, said Tracey Miller, Dublin's deputy superintendent.

Although a sixth middle school is not expected to be needed, the district by 2029 likely will need a 15th elementary school, Miller said.

The school district is seeking a combination $195 million bond issue, a 2-mill permanent-improvements levy and a 5.9-mill operating levy on the November ballot. The tax issue would provide money for elementary schools 13 and 14 and a fifth middle school.

An elementary school and middle school would be built in Jerome Village, while another elementary school would be built on Bright Road.

Additions to the district's high schools -- most likely two of them -- would be funded by the levy should it pass in November, Miller said.

The district would pay for a 15th elementary through another bond issue, Kern said.

"The 15th elementary is many years away, probably at least 10 years, so I couldn't reasonably estimate what construction costs would be at that time," he said.

The district has property on which a 15th elementary could be built, Miller said.

Land at Karrer Middle School, 7245 Tullymore Drive, could be used for a new elementary school, he said.

The Tech House near the district's central office, 7030 Coffman Road, could also be used as an elementary school in the future, he said.