How do I read innertext of a p-tag with runat="server" in code behind?

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ASP.NET

Javascript

jQuery

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The problem I'm having is in ASP.NET I'm assigning data to p-tag innerText from JQuery when the form loads, and that's working fine. But then, in Code Behind, when I try to reference the same innerText of the same p-tags, they all come into the Code Behind as empty strings, even though the data is displaying fine on the form. I am using runat="server" in the p-tags.

Note also that, just for testing, I tried hard-coding sine text into p-tag pPlaceId like this:

<p id="pPlaceId">This is a test.</p>

and if hard-coded this way, it is retrieved successfully in the Code-Behind.

Here is the top line of the HTML/JavaScript page:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="MyWebForm.aspx.cs" Inherits="MyAppName.MyWebForm" %>

What can I do get the p-tag contents that is assigned and not hard-coded to be accessible in the Code-Behind?

What I have tried:

I have this JQuery code setting innerText of three p-tags in ASP.NET. It's working perfectly and populates three p-tags from localStorage when the form loads.

<script>
        $(document).ready(function () {
            document.getElementById("pPlaceId").innerText = localStorage.getItem("Map_PlaceId");
            document.getElementById("pPlaceName").innerText = localStorage.getItem("Map_PlaceName");
            document.getElementById("pPlaceAddress").innerText = localStorage.getItem("Map_PlaceVicinity");
        });
</script>

I have a Container div tag that contains a form tag that specifies runat="server", and I have within the form, these three p-tags located within div row and div col elements:

<p id="pPlaceId" runat="server"></p>
<p id="pPlaceName" runat="server"></p>
<p id="pPlaceAddress" runat="server"></p>

When the form loads, the p-tags are populated with data as expected. The page acts as a confirmation page. It displays the three pieces of info that were sent and provides two button, Submit and Cancel.

When I click the Submit button, it successfully executes the Click handler in the Code Behind, no problem there. But in the Click handler, retrieval of the innerText of the p-tags fails. Each one comes in as an empty string.

Code Behind

protected void btnSubmit_Click(object sender, EventArgs e)
{
    //Read the connection string from Web.Config file
    string ConnectionString = ConfigurationManager.ConnectionStrings["HCCS"].ConnectionString;
    oLL = new LocLogin();
    oLL.PersonID = Convert.ToInt32(this.Session["UserID"].ToString());
    try
    {
        oLL.PlaceID = pPlaceId.InnerText;
        oLL.LocName = pPlaceName.InnerText;
        oLL.LocAddress = pPlaceAddress.InnerText;

if(oLL.PlaceID != null)
{
    <Code to serialize data>
}
    }
    catch ( Exception ex)
    {
        string exception1 = ex.InnerException.ToString();
    }
        <Other code>
    }
<Other code>

}