diff --git a/main.js b/main.js
index 8c060523..bed042bb 100644
--- a/main.js
+++ b/main.js
@@ -1186,7 +1186,7 @@ function rankCells() {
   console.time('rankCells');
   const cells = pack.cells, f = pack.features;
   cells.s = new Int16Array(cells.i.length); // cell suitability array
-  cells.pop = new Uint16Array(cells.i.length); // cell population array
+  cells.pop = new Float32Array(cells.i.length); // cell population array
 
   const flMean = d3.median(cells.fl.filter(f => f)), flMax = d3.max(cells.fl) + d3.max(cells.conf); // to normalize flux
   const areaMean = d3.mean(cells.area); // to adjust population by cell area
diff --git a/modules/save-and-load.js b/modules/save-and-load.js
index 67a1eeba..c1b01244 100644
--- a/modules/save-and-load.js
+++ b/modules/save-and-load.js
@@ -198,12 +198,15 @@ function getMapData() {
       return `${b.name}|${b.min}|${b.max}|${b.d}|${b.m}|${names}`;
     }).join("/");
 
+    // round population to save resources
+    const pop = Array.from(pack.cells.pop).map(p => rn(p, 4));
+
     // data format as below
     const data = [params, options, coords, biomes, notesData, svg_xml,
       gridGeneral, grid.cells.h, grid.cells.prec, grid.cells.f, grid.cells.t, grid.cells.temp,
       features, cultures, states, burgs,
       pack.cells.biome, pack.cells.burg, pack.cells.conf, pack.cells.culture, pack.cells.fl,
-      pack.cells.pop, pack.cells.r, pack.cells.road, pack.cells.s, pack.cells.state,
+      pop, pack.cells.r, pack.cells.road, pack.cells.s, pack.cells.state,
       pack.cells.religion, pack.cells.province, pack.cells.crossroad, religions, provinces,
       namesData].join("\r\n");
     const blob = new Blob([data], {type: "text/plain"});
@@ -666,7 +669,7 @@ function parseLoadedData(data) {
       cells.conf = Uint8Array.from(data[18].split(","));
       cells.culture = Uint16Array.from(data[19].split(","));
       cells.fl = Uint16Array.from(data[20].split(","));
-      cells.pop = Uint16Array.from(data[21].split(","));
+      cells.pop = Float32Array.from(data[21].split(","));
       cells.r = Uint16Array.from(data[22].split(","));
       cells.road = Uint16Array.from(data[23].split(","));
       cells.s = Uint16Array.from(data[24].split(","));
diff --git a/modules/ui/burg-editor.js b/modules/ui/burg-editor.js
index 402b2df2..88c7653f 100644
--- a/modules/ui/burg-editor.js
+++ b/modules/ui/burg-editor.js
@@ -235,7 +235,7 @@ function editBurg(id) {
 
   function changePopulation() {
     const id = +elSelected.attr("data-id");
-    pack.burgs[id].population = burgPopulation.value / populationRate.value / urbanization.value;
+    pack.burgs[id].population = rn(burgPopulation.value / populationRate.value / urbanization.value, 4);
   }
 
   function toggleFeature() {
diff --git a/modules/ui/cultures-editor.js b/modules/ui/cultures-editor.js
index 7c27a9fc..4d696e68 100644
--- a/modules/ui/cultures-editor.js
+++ b/modules/ui/cultures-editor.js
@@ -237,7 +237,7 @@ function editCultures() {
     });
 
     function applyPopulationChange() {
-      const ruralChange = rn(ruralPop.value / rural, 4);
+      const ruralChange = ruralPop.value / rural;
       if (isFinite(ruralChange) && ruralChange !== 1) {
         const cells = pack.cells.i.filter(i => pack.cells.culture[i] === culture);
         cells.forEach(i => pack.cells.pop[i] *= ruralChange);
@@ -249,13 +249,13 @@ function editCultures() {
         cells.forEach(i => pack.cells.pop[i] = pop);
       }
 
-      const urbanChange = rn(urbanPop.value / urban, 4);
+      const urbanChange = urbanPop.value / urban;
       if (isFinite(urbanChange) && urbanChange !== 1) {
-        burgs.forEach(b => b.population *= urbanChange);
+        burgs.forEach(b => b.population = rn(b.population * urbanChange, 4));
       }
       if (!isFinite(urbanChange) && +urbanPop.value > 0) {
         const points = urbanPop.value / populationRate.value / urbanization.value;
-        const population = rn(points / burgs.length);
+        const population = rn(points / burgs.length, 4);
         burgs.forEach(b => b.population = population);
       }
 
diff --git a/modules/ui/heightmap-editor.js b/modules/ui/heightmap-editor.js
index 9c1c321f..02a146fd 100644
--- a/modules/ui/heightmap-editor.js
+++ b/modules/ui/heightmap-editor.js
@@ -263,7 +263,7 @@ function getHeight(h) {
 
     // assign saved pack data from grid back to pack
     const n = pack.cells.i.length;
-    pack.cells.pop = new Uint16Array(n);
+    pack.cells.pop = new Float32Array(n);
     pack.cells.road = new Uint16Array(n);
     pack.cells.crossroad = new Uint16Array(n);
     pack.cells.s = new Uint16Array(n);
diff --git a/modules/ui/provinces-editor.js b/modules/ui/provinces-editor.js
index 6c313623..80b57343 100644
--- a/modules/ui/provinces-editor.js
+++ b/modules/ui/provinces-editor.js
@@ -114,9 +114,9 @@ function editProvinces() {
       const focused = defs.select("#fog #focusProvince"+p.i).size();
       lines += `<div class="states" data-id=${p.i} data-name=${p.name} data-form=${p.formName} data-color="${p.color}" data-capital="${capital}" data-state="${stateName}" data-area=${area} data-population=${population}>
         <svg data-tip="Province fill style. Click to change" width=".9em" height=".9em" style="margin-bottom:-1px"><rect x="0" y="0" width="100%" height="100%" fill="${p.color}" class="zoneFill"></svg>
-        <input data-tip="Province name. Click and type to change" class="name pointer" value="${p.name}" readonly>
+        <input data-tip="Province name. Click to change" class="name pointer" value="${p.name}" readonly>
         <span data-tip="Click to open province COA in the Iron Arachne Heraldry Generator. Ctrl + click to change the seed" class="icon-fleur pointer hide"></span>
-        <input data-tip="Province form name. Click and type to change" class="name pointer hide" value="${p.formName}" readonly>
+        <input data-tip="Province form name. Click to change" class="name pointer hide" value="${p.formName}" readonly>
         <span data-tip="Province capital. Click to zoom into view" class="icon-star-empty pointer hide ${p.burg?'':'placeholder'}"></span>
         <select data-tip="Province capital. Click to select from burgs within the state. No capital means the province is governed from the state capital" class="cultureBase hide ${p.burgs.length?'':'placeholder'}">${p.burgs.length ? getCapitalOptions(p.burgs, p.burg) : ''}</select>
         <input data-tip="Province owner" class="provinceOwner" value="${stateName}" disabled">
@@ -305,7 +305,7 @@ function editProvinces() {
     });
 
     function applyPopulationChange() {
-      const ruralChange = rn(ruralPop.value / rural, 4);
+      const ruralChange = ruralPop.value / rural;
       if (isFinite(ruralChange) && ruralChange !== 1) {
         cells.forEach(i => pack.cells.pop[i] *= ruralChange);
       }
@@ -315,13 +315,13 @@ function editProvinces() {
         cells.forEach(i => pack.cells.pop[i] = pop);
       }
 
-      const urbanChange = rn(urbanPop.value / urban, 4);
+      const urbanChange = urbanPop.value / urban;
       if (isFinite(urbanChange) && urbanChange !== 1) {
-        p.burgs.forEach(b => pack.burgs[b].population *= urbanChange);
+        p.burgs.forEach(b => pack.burgs[b].population = rn(pack.burgs[b].population * urbanChange, 4));
       }
       if (!isFinite(urbanChange) && +urbanPop.value > 0) {
         const points = urbanPop.value / populationRate.value / urbanization.value;
-        const population = rn(points / burgs.length);
+        const population = rn(points / burgs.length, 4);
         p.burgs.forEach(b => pack.burgs[b].population = population);
       }
 
diff --git a/modules/ui/religions-editor.js b/modules/ui/religions-editor.js
index 7a24b978..f29503db 100644
--- a/modules/ui/religions-editor.js
+++ b/modules/ui/religions-editor.js
@@ -263,7 +263,7 @@ function editReligions() {
     });
 
     function applyPopulationChange() {
-      const ruralChange = rn(ruralPop.value / rural, 4);
+      const ruralChange = ruralPop.value / rural;
       if (isFinite(ruralChange) && ruralChange !== 1) {
         const cells = pack.cells.i.filter(i => pack.cells.religion[i] === religion);
         cells.forEach(i => pack.cells.pop[i] *= ruralChange);
@@ -275,13 +275,13 @@ function editReligions() {
         cells.forEach(i => pack.cells.pop[i] = pop);
       }
 
-      const urbanChange = rn(urbanPop.value / urban, 4);
+      const urbanChange = urbanPop.value / urban;
       if (isFinite(urbanChange) && urbanChange !== 1) {
-        burgs.forEach(b => b.population *= urbanChange);
+        burgs.forEach(b => b.population = rn(b.population * urbanChange, 4));
       }
       if (!isFinite(urbanChange) && +urbanPop.value > 0) {
         const points = urbanPop.value / populationRate.value / urbanization.value;
-        const population = rn(points / burgs.length);
+        const population = rn(points / burgs.length, 4);
         burgs.forEach(b => b.population = population);
       }
 
diff --git a/modules/ui/states-editor.js b/modules/ui/states-editor.js
index 8cfe82db..632f4a75 100644
--- a/modules/ui/states-editor.js
+++ b/modules/ui/states-editor.js
@@ -331,7 +331,7 @@ function editStates() {
     });
 
     function applyPopulationChange() {
-      const ruralChange = rn(ruralPop.value / rural, 4);
+      const ruralChange = ruralPop.value / rural;
       if (isFinite(ruralChange) && ruralChange !== 1) {
         const cells = pack.cells.i.filter(i => pack.cells.state[i] === state);
         cells.forEach(i => pack.cells.pop[i] *= ruralChange);
@@ -339,19 +339,19 @@ function editStates() {
       if (!isFinite(ruralChange) && +ruralPop.value > 0) {
         const points = ruralPop.value / populationRate.value;
         const cells = pack.cells.i.filter(i => pack.cells.state[i] === state);
-        const pop = rn(points / cells.length);
+        const pop = points / cells.length;
         cells.forEach(i => pack.cells.pop[i] = pop);
       }
 
-      const urbanChange = rn(urbanPop.value / urban, 4);
+      const urbanChange = urbanPop.value / urban;
       if (isFinite(urbanChange) && urbanChange !== 1) {
         const burgs = pack.burgs.filter(b => !b.removed && b.state === state);
-        burgs.forEach(b => b.population *= urbanChange);
+        burgs.forEach(b => b.population = rn(b.population * urbanChange, 4));
       }
       if (!isFinite(urbanChange) && +urbanPop.value > 0) {
         const points = urbanPop.value / populationRate.value / urbanization.value;
         const burgs = pack.burgs.filter(b => !b.removed && b.state === state);
-        const population = rn(points / burgs.length);
+        const population = rn(points / burgs.length, 4);
         burgs.forEach(b => b.population = population);
       }
 
diff --git a/modules/ui/zones-editor.js b/modules/ui/zones-editor.js
index 663c25fb..3406f702 100644
--- a/modules/ui/zones-editor.js
+++ b/modules/ui/zones-editor.js
@@ -393,7 +393,7 @@ function editZones() {
     });
 
     function applyPopulationChange() {
-      const ruralChange = rn(ruralPop.value / rural, 4);
+      const ruralChange = ruralPop.value / rural;
       if (isFinite(ruralChange) && ruralChange !== 1) {
         cells.forEach(i => pack.cells.pop[i] *= ruralChange);
       }
@@ -403,13 +403,13 @@ function editZones() {
         cells.forEach(i => pack.cells.pop[i] = pop);
       }
 
-      const urbanChange = rn(urbanPop.value / urban, 4);
+      const urbanChange = urbanPop.value / urban;
       if (isFinite(urbanChange) && urbanChange !== 1) {
-        burgs.forEach(b => b.population *= urbanChange);
+        burgs.forEach(b => b.population = rn(b.population * urbanChange, 4));
       }
       if (!isFinite(urbanChange) && +urbanPop.value > 0) {
         const points = urbanPop.value / populationRate.value / urbanization.value;
-        const population = rn(points / burgs.length);
+        const population = rn(points / burgs.length, 4);
         burgs.forEach(b => b.population = population);
       }