Thirteen years ago this week, Hurricane Katrina hit New Orleans and the city began its long, arduous recovery. The construction industry still looms large, but other fast-growing companies are making their mark in the Big Easy's burgeoning tech scene, helped along by a relatively low cost of living and an influx of college graduates. Here are the top New Orleans companies on this year's Inc. 5000 list--Inc.'s annual tally of the fastest-growing private companies in America.

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7. Imaginal Marketing Group

2018 Inc. 5000 rank No. 4,727 Three-year growth 66% 2017 revenue $3.5M

This four-time Inc. 5000 company, which offers marketing services to companies in the beauty and fashion industries, has two offices in different parts of New Orleans to shorten employees' commutes. The name Imaginal comes not from the word "imagine," but from the scientific name for the cells involved in a butterfly's metamorphosis.

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6. Hernandez Consulting & Construction

2018 Inc. 5000 rank No. 2,987 Three-year growth 136% 2017 revenue $43.9M

Alex Hernandez, a former Marine and Citigroup executive, founded Hernandez Consulting & Construction in 2005 to help rebuild after Katrina. It has since flourished, landing on the Inc. 5000 list six times. The company and its subsidiaries provide project management, construction, architecture, and sustainability services to the government.

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5. Ready Power

2018 Inc. 5000 rank No. 2,604 Three-year growth 164% 2017 revenue $4.1M

Ready Power was founded in 2009 as a construction company for specialized electrical projects. Its offerings range from backup generators to lighting for sports fields. Ready Power also made the Inc. 5000 list last year, clocking in at No. 4,397.

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4. Complete Logistical Services

2018 Inc. 5000 rank No. 2,429 Three-year growth 178% 2017 revenue $13.9M

Founded in 2010, this staffing firm provides maritime personnel, including ship crews, divers, and land-based labor, to companies in the oil and gas industry. 

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3. Colmex Construction

2018 Inc. 5000 rank No. 2,326 Three-year growth 188% 2017 revenue $7.2M

Colmex Construction started in 2008 as a framing company. Its services now include residential and commercial construction and remodeling, with a focus on energy efficiency and community service.

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2. Scott, Vicknair, Hair & Checki

2018 Inc. 5000 rank No. 1,155 Three-year growth 425% 2017 revenue $3.6M

This midsize law firm was founded in 2011 and has since expanded into a team of 14 attorneys, who handle cases ranging from personal injury and consumer protection suits to estate planning and environmental law, in addition to pro bono work.

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1. Palmisano

2018 Inc. 5000 rank No. 1,126 Three-year growth 439% 2017 revenue $86.8M

This family-owned construction business was originally founded in 1950 by Warren Palmisano Sr., grandfather of current CEO Wesley J. Palmisano. Wesley took over in 2013 and added civil and commercial projects to the company's portfolio. This is Palmisano's second consecutive year on the Inc. 5000 list; it was also featured on Inc.'s 2018 Best Workplaces list.