Limits for Your Classic Load Balancer
Your AWS account has the following limits related to Classic Load Balancers. If needed, you can request an increase in the number of load balancers for your AWS account using the Elastic Load Balancing Limits form.
Load balancers per region: 20 †
Listeners per load balancer: 100
Security groups per load balancer: 5
Subnets per Availability Zone per load balancer: 1
† This limit includes both your Application Load Balancers and your Classic Load Balancers.